36549
2016
eng
conferenceobject
19th World Conference on Non-Destructive Testing 2016
0
--
--
--
Characterization of multiphase metal matrix composites by means of CT and neutron diffraction
The present study examines the relationship between the microstructure of multiphase metal matrix composites and their damage mechanisms. The matrix AlSi12CuMgNi was combined with 15% vol. Al₂O₃ (short fibers), and with 7% vol. Al₂O₃ + 15% vol. SiC (short fibers and whiskers, respectively). The experimental approach encompasses 3D microstructure characterization by means of computed tomography of samples (a) as-cast, (b) after heat treatment, and (c) after compression tests at room temperature. The volume fraction of different phases, their distribution, their orientation, and the presence of defects and damage are studied.
The influence of the addition of SiC particles on mechanical properties of composite was investigated. Phase-specific load partition analysis for samples with fiber plane parallel to load was performed by using neutron diffraction (ND) during in-situ compression. ND results show damage in the Si phase, while Al₂O₃ short fibers carry load without damage until failure. The computed tomography observations confirm the load partition analysis.
urn:nbn:de:kobv:b43-365499
WCNDT
München, Germany
13.06.2016
17.06.2016
Creative Commons - Namensnennung-Keine Bearbeitung
Sandra Cabeza
eng
uncontrolled
thermal treatment
eng
uncontrolled
synchrotron CT
eng
uncontrolled
neutron diffraction
eng
uncontrolled
composite
eng
uncontrolled
aluminum
eng
uncontrolled
residual stress
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei für die Öffentlichkeit verfügbar ("Open Access")
Graue Literatur
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/36549/We_4_I_3_Cabeza_FINAL.pdf
36357
2016
eng
115
118
122
article
Elsevier B.V.
Amsterdam, Netherlands
1
--
--
--
The role of reinforcement orientation on the damage evolution of AlSi12CuMgNi + 15% Al2O3 under compression
Internal damage of an AlSi12CuMgNi alloy reinforced with planar random short fibres has been investigated after compression. This damage strongly influences the load partition between matrix and reinforcement. For fibres perpendicular to the applied load, breakage and interconnected cracks appear in significantly higher volume fraction than with fibres parallel to load.
Scripta Materialia
10.1016/j.scriptamat.2016.05.023
1359-6462
29.07.2016
Sandra Cabeza
Tatiana Mishurova
Giovanni Bruno
G. Garcés
eng
uncontrolled
Neutron Diffraction
eng
uncontrolled
Damage
eng
uncontrolled
Metal Matrix Composites
eng
uncontrolled
Load Partition
eng
uncontrolled
Synchrotron CT
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
36358
2016
eng
107
112
107
article
Elsevier Ltd.
Oxford, UK
1
--
--
--
Influence of long period stacking ordered phase arrangements on thecorrosion behaviour of extruded Mg97Y2Zn1 alloy
The influence of second phase arrangements on the corrosion resistance of extruded Mg97Y2Zn1 alloy has been evaluated in a 0.1 M NaCl solution. The microstructure of the alloy consists of a high volume fraction of coarse elongated particles of a long period stacking ordered phase aligned along the extrusion direction. Corrosion rate of transversal sections is lower than that of longitudinal sections. Such difference is attributed to the different orientation of second phases in longitudinal and transversal sections. The corrosion front advances mainly perpendicular to the surface in transversal samples while perpendicular and lateral growth occur in longitudinal samples
Corrosion Science
10.1016/j.corsci.2016.02.024
0010-938X
06.06.2016
P. Pérez
Sandra Cabeza
G. Garcés
Paloma Adeva
eng
uncontrolled
passive films
eng
uncontrolled
Magnesium alloys
eng
uncontrolled
anodic dissolution
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
36359
2015
eng
287
293
647
article
Elsevier B.V.
Amsterdam, Netherlands
0
--
--
--
Reverse tension /compression asymmetry of a Mg–Y–Zn alloys
Room temperature mechanical behavior of extruded Mg–Y–Zn alloys with varying fractions of LPSO phase was studied in tension and compression along the extrusion direction. The microstructure is characterized by elongated LPSO fibers along the extrusion direction within the magnesium matrix. Moreover, the magnesium matrix presents a bimodal grain structure with dynamically-recrystallized grains and deformed, elongated grains with the basal plane parallel to the extrusion direction. The beginning of plasticity depends on the volume fraction of deformed and DRX grains. Alloys with low volume fraction of LPSO phase(o10vol%),with a high volume fraction of deformed grains, show the typical behavior of extruded magnesium alloys where yield stress in tension is higher than in compression. This effect is, however, reversed as the volume fraction of the LPSO phase increases since DRX grains are majority.
Materials Science & Engineering
doi:10.1016/j.msea.2015.09.003
G. Garcés
P. Perez
Sandra Cabeza
H.K. Lin
S. Kim
W. Gan
Paloma Adeva
eng
uncontrolled
plasticity
eng
uncontrolled
Magnesium alloy
eng
uncontrolled
LPSO
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
37975
2016
eng
115
118
122
article
Elsevier Ltd.
1
--
--
--
The role of reinforcement orientation on the damage evolution of AlSi12CuMgNi +15% Al2O3 under compression
Internal damage of an AlSi12CuMgNi alloy reinforced with planar randomshort fibres has been investigated after compression. This damage strongly influences the load partition between matrix and reinforcement. For fibres perpendicular to the applied load, breakage and interconnected cracks appear in significantly higher volume fraction than with fibres parallel to load.
Scripta Materialia
01.04.2020
Giovanni Bruno
Sandra Cabeza
Tatiana Mishurova
G. Garcés
G. Requena
eng
uncontrolled
Metal Matrix Composites
eng
uncontrolled
Damage
eng
uncontrolled
Load partition
eng
uncontrolled
Synchrotron CT
eng
uncontrolled
Neutron diffraction
Analytische Chemie
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
37738
2016
eng
245
261
106
article
Elsevier Ltd.
1
--
--
--
Average phase stress concentrations in multiphase metal matrix composites under compressive loading
We develop a model to predict average over individual phases stress concentrations in a multiphase metal matrix composite under compressive loading. The model accounts for matrix plasticity through variation of the shear modulus with applied stress and for frac- ture of filler through change in the shape of the particles. Three micromechanical models are compared –non interaction approximation, Mori–Tanaka–Benveniste (MTB) scheme, and Maxwell scheme. Comparison with the experimental measurements of Cabeza et al. (2016) shows that Maxwell scheme generally predicts the stress concentration with satis- factory accuracy. Results of MTB scheme vary depending on the loading case and ignoring of the interaction leads to substantial overestimation of the stresses.
International Journal of Engineering Science
10.1016/j.ijengsci.2016.06.004
0020-7225
13.10.2016
Giovanni Bruno
I. Sevostianov
Sandra Cabeza
Tatiana Mishurova
eng
uncontrolled
Average phase stress concentrations
eng
uncontrolled
metal matrix composite
eng
uncontrolled
multiphase composite
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
38395
2016
eng
lecture
0
--
--
--
Characterization of multiphase metal matrix composites by means of CT and neutron diffraction
The present study examines the relationship between the microstructure of multiphase MMC and their damage mechanisms. The matrix AlSi12CuMgNi was combined with 15% vol. Al2O3 (short fibres) and with 7% vol. Al2O3 + 15% vol. SiC (short fibres and whiskers, respectively). The experimental approach encompasses 3D microstructure characterization by means of computed tomography of samples (a) as-received, (b) after heat treatment, and (c) after compression tests at room temperature. The volume fraction of different phases, their distribution, their orientation and the presence of defects and damage are studied.
Influence of addition of SiC whiskers on mechanical properties of composite was investigated. Phase-specific load partition analysis for samples with fibre plane parallel to load was perform by using neutron diffraction measurements during in-situ compression. It shows damage in the Si phase, while Al2O3 short fibres carry load without damage until failure. The computed tomography observations confirm the load partition analysis.
World Non Destructive Testing
München, Germany
11.06.2016
15.06.2016
0
Sandra Cabeza
eng
uncontrolled
CT
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Aluminium
eng
uncontrolled
Composite
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
38396
2016
eng
lecture
0
--
--
--
Neutron diffraction: the forgotten non-destructive technique for residual stress analysis … and more
3-D Stress Analysis
(Bulk) Stress mapping
Thick (and thin) films & Interfaces
Bulk high temperature
Real time
In-situ testing: Large sample environment (Stress rigs, Furnaces, …)
Neutrons and Synchrotron Radiation allow all this because they are FASTER , DEEPER and MORE PRECISE than lab equipment
(Flux)(Energy)(Parallel Beam)
World Non Destructive Testing
München, Germany
11.06.2016
15.06.2016
0
Giovanni Bruno
Sandra Cabeza
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Stress analysis
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
38397
2011
eng
lecture
0
--
--
--
The evolution of internal strain in Mg-Y-Zn alloys with a long period stacking ordered phase
The load partition in Mg-Y-Zn system is studied by means of synchrotron diffraction. in-situ tensile tests disclose LPSO phases were for the first time proved to behave as an efficient reinforcement in Mg-Y-Zn alloys, therefore they could be treated as “short-fibre composite” for the modeling of mechanical behaviour.
MECASENS
Grenoble, France
16.09.2015
0
Sandra Cabeza
eng
uncontrolled
Magnesium
eng
uncontrolled
LPSO
eng
uncontrolled
Synchrotron diffraction
eng
uncontrolled
Load partition
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
38398
2015
eng
poster
0
--
--
--
Low alloyed Mg-Y/RE-Zn alloys: mechanical and corrosion behaviour
Mg-Y,RE-Zn systems present second phases with high thermal stability, promoting the increase of strength and creep resistance at high temperatures.
Mg and its alloys have a potential application as biomaterials due to their biocompatibility and degradation behaviour. The dominant corrosion mechanism in those alloys is the microgalvanic corrosion through coupling of the more noble second phases with the Mg matrix, and therefore a low concentration of those was sought.
Mg 2015
Jeju, South Korea
12.10.2015
Sandra Cabeza
eng
uncontrolled
Magnesium
eng
uncontrolled
LPSO
eng
uncontrolled
Corrosion behaviour
eng
uncontrolled
Mechanichal behaviour
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
32704
2015
eng
115
126
46
article
Elsevier Ltd.
Amsterdam [u.a.]
1
--
--
--
Properties of WZ21 (%wt) alloy processed by a powder metallurgy route
Microstructure, mechanical properties and corrosion behaviour of WZ21 (%wt.) alloy prepared by a powder metallurgy route from rapidly solidified powders have been studied. Results were compared to those of the same alloy prepared through a conventional route of casting and extrusion. The microstructure of the extruded ingot consisted of α-Mg grains and Mg3Zn3Y2 (W-phase) and LPSO-phase particles located at grain boundaries. Moreover, stacking faults were also observed within α-Mg grains. The alloy processed by the powder metallurgy route exhibited a more homogeneous and finer microstructure, with a grain size of 2 µm. In this case W-phase and Mg24Y5 phase were identified, but not the LPSO-phase. The microstructural refinement induced by the use of rapidly solidified powders strengthened the alloy at room temperature and promoted superplasticity at higher strain rates. Corrosion behaviour in PBS medium evidenced certain physical barrier effect of the almost continuous arrangements of second phases aligned along the extrusion direction in conventionally processed WZ21 alloy, with a stable tendency around 7 mm/year. On the other hand, powder metallurgy processing promoted significant pitting corrosion, inducing accelerated corrosion rate during prolonged immersion times.
Journal of the mechanical behavior of biomedical materials
35780
10.1016/j.jmbbm.2015.02.022
1751-6161
1878-0180
05.03.2015
Sandra Cabeza
G. Garcés
P. Pérez
Paloma Adeva
eng
uncontrolled
Magnesium
eng
uncontrolled
RE
eng
uncontrolled
Microstructure
eng
uncontrolled
Creep
eng
uncontrolled
Corrosion
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
38678
2017
eng
580
587
426
article
Elsevier
Amsterdam
1
--
--
--
Residual stress characterization of steel TIG welds by neutron diffraction and by residual magnetic stray field mappings
The residual stress distribution of tungsten inert gas welded S235JRC+C plates was determined by means of neutron diffraction(ND). Large longitudinal residual stresses with maxima around 600 MPa were found. With these results as reference, the evaluation of residual stress with high spatial resolution GMR (giant magneto resistance) sensors was discussed. The experiments performed indicate a correlation between changes in residual stresses (ND) and the normal component of local residual magnetic stray fields (GMR). Spatial variations in the magnetic field strength perpendicular to the welds are in the order of the magnetic field of the earth.
Journal of Magnetism and Magnetic Materials
10.1016/j.jmmm.2016.11.102
0304-8853
1873-4766
20.04.2017
Robert Stegemann
Sandra Cabeza
V. Lyamkin
Giovanni Bruno
Andreas Pittner
Robert Wimpory
M. Boin
Marc Kreutzbruck
eng
uncontrolled
GMR
eng
uncontrolled
Magnetic stray field
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Residual stress
eng
uncontrolled
TIG-welding
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Ingenieurbau
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
38660
2016
eng
poster
0
--
--
--
Residual stress characterization of IN718 part obtained by selective laser melting
Additive Manufacturing (AM) by Selective Laser Melting (SLM) offers ample scope for producing geometrically complex parts as compared to the traditional subtractive manufacturing strategies. However, the residual stresses developed during the processing can reduce the load bearing capacity as well as induce unwanted distortion, limiting the application of SLM parts.
IN718 manufactured by SLM process can show high tensile residual stresses in the surface as high as the yield strength of the wrought alloy. On the other hand, residual stresses in the bulk Show considerably lower stress values, even in compression, indicating a stress re-distribution during deposition of the SLM layers.
HZB User meeting
BESSY II, Berlin, Germany
08.12.2016
Sandra Cabeza
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Residual stress
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Neintron diffraction
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
39139
2017
eng
poster
0
--
--
--
Development of residual stresses in IN718 parts obtained by SLM
Additive Manufacturing by Selective Laser Melting (SLM) offers ample scope for producing geometrically complex parts as compared to the traditional subtractive manufacturing strategies. However, the residual stresses (RS) developed during the processing can reduce the load bearing capacity as well as induce unwanted distortion, limiting the application of SLM parts. In the present work, residual stresses in additivly manufactured IN718 part were analised by means of neutron diffraction and synchrotron X-ray diffraction.
ISAM 2017
Dresden, Germany
07.02.2017
09.02.2017
Sandra Cabeza
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Residual stress
eng
uncontrolled
Inconel 718
eng
uncontrolled
Netron diffraction
eng
uncontrolled
Microstructure
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
45325
2018
eng
1
conferenceobject
0
--
--
--
An assessment of bulk residual stress in selective laser melted Inconel 718
Additive Manufacturing (AM) of metals has become industrially viable for a large variety of applications, including aerospace, automotive and medicine. Powder bed techniques such as Selective Laser Melting (SLM) based on layer-by-layer deposition and laser melt enable numerous degrees of freedom for the geometrical design. Developing during the manufacturing process, residual stresses may limit the application of SLM parts by reducing the load bearing capacity as well as induce unwanted distortion depending on the boundary conditions specified in manufacturing.
The residual stress distribution in the bulk of IN718 elongated prisms produced by SLM was studied non-destructively by means of neutron diffraction. The samples with different scanning strategies, i.e. hatching length, were measured in as-build condition (on a build plate) and after removal from the build plate.
The absolute values of all stress components decreased after removal from the build plate. Together with surface scan utilizing a coordinate-measuring machine (CMM), it is possible to link the stress release to the sample distortion. Obtained results indicated different residual stress states for each of the transversal, longitudinal and normal component depending on the thermal gradient in the respective direction.
Proceedings ECNDT2018
http://cdn.ecndt2018.com/wp-content/uploads/2018/05/ecndt-0315-2018-File001.pdf
ECNDT 2018
Göteborg, Sweden
11.06.2018
Tobias Thiede
Sandra Cabeza
Tatiana Mishurova
Naresh Nadammal
Arne Kromm
Johannes Bode
C. Haberland
Giovanni Bruno
eng
uncontrolled
Residual stress
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
IN718
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.2 Versuchsanlagen und Prüftechnik
9.4 Integrität von Schweißverbindungen
Material
Degradation von Werkstoffen
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Graue Literatur
5.0 Abteilungsleitung und andere
Additive Fertigung
45255
2018
eng
344
350
731
article
Elsevier
Amsterdam
1
--
--
--
Residual stress and yield strength evolution with annealing treatments in an age-hardenable aluminum alloy matrix composite
We investigated the possibility of minimizing tensile matrix residual stresses in age hardenable aluminum alloy metal matrix composites without detrimentally affect their mechanical properties (such as yield strength).
Specifically, we performed thermal treatments at different temperatures and times in an age-hardenable aluminum matrix composite 2014Al-15vol%Al2O3. Using X-ray synchrotron radiation diffraction and mechanical tests, we show that below a certain treatment temperature (250 °C) it is possible to identify an appropriate thermal treatment capable of relaxing residual stress in this composite while even increasing its yield strength, with respect to the as processed conditions.
Materials Science & Engineering A
10.1016/j.msea.2018.06.031
0921-5093
1873-4936
07.09.2018
R. Fernández
Sandra Cabeza
Tatiana Mishurova
P. Fernández-Castrillo
G. González-Doncel
Giovanni Bruno
eng
uncontrolled
Residual stress
eng
uncontrolled
X-ray diffraction
eng
uncontrolled
Annealing treatment
eng
uncontrolled
Metal matrix composite
eng
uncontrolled
Yield strength
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
44619
2018
eng
420
427
51
article
Wiley
1
--
--
--
Evidence of damage evolution during creep of Al–Mg alloy using synchrotron X-ray refraction
In order to provide further evidence of damage mechanisms predicted by the recent solid-state transformation creep (SSTC) model, direct observation of damage accumulation during creep of Al–3.85Mg was made using synchrotron X-ray refraction. X-ray refraction techniques detect the internal specific surface (i.e. surface per unit volume) on a length scale comparable to the specimen size, but with microscopic sensitivity. A significant rise in the internal specific surface with increasing creep time was observed, providing evidence for the creation of a fine grain substructure, as predicted by the SSTC model. This substructure was also observed by scanning electron microscopy
Journal of applied crystallography
1600-5767
10.1107/S1600576718001449
19.04.2018
Sandra Cabeza
Bernd R. Müller
R. Pereyra
R. Fernández
G. González-Doncel
Giovanni Bruno
eng
uncontrolled
Aluminium alloys
eng
uncontrolled
Creep
eng
uncontrolled
Damage
eng
uncontrolled
Synchrotron X-ray refraction
eng
uncontrolled
Electron microscopy
eng
uncontrolled
subgrain structure
Analytische Chemie
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Degradation von Werkstoffen
Chemie und Prozesstechnik
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
44694
2018
eng
poster
0
--
--
--
Influence of deposition hatch length on residual stress in selective laser melted Inconel 718
The present study aims to evaluate the bulk residual stresses in SLM parts by using neutron diffraction measurements performed at E3 line -BER II neutron reactor- of Helmholtz-Zentrum für Materialien und Energie (HZB) Berlin. Together with microstructure characterization and distortion measurements, it is possible to describe the stress state throughout the whole sample. The sample was measured in as-build condition (on a build plate) and after releasing from the build plate. The used material is the nickel based superalloy 718. This alloy is widely used in aerospace and chemical industries due to its superior corrosion and heat resistant properties.
Obtained results indicated different residual stress states for each of the transversal, longitudinal and normal component. The normal and transversal component exhibits a rather compressive behavior while the longitudinal was tensile in the center part of the sample and became compressive towards the tip. As expected, the absolute values of all stress components decreased after releasing the sample from the building plate. A surface scan utilizing a coordinate-measuring machine (CMM) allowed us to present top surface distortion before and after releasing. The top surface showed a distortion around ±80µm after releasing. Microstructure evolution in the scanning-building cross-section is largely dominated by columnar grains. In addition, many small random orientated grains are prominent in the regions of a laser overlap during SLM.
In summary, for the sample of superalloy 718 manufactured by SLM, a small distortion occurred when removing the sample from the build plate whereby the residual stress state decreases. Moreover, the observed columnar grains in the building direction could give a reason for the lowest stress values in that normal direction. However, the most important parameter controlling the residual stresses is the temperature gradient. Hence, future investigations are planned for a different scan strategy to distribute the laser impact in a more homogenous manner.
WAM2018
Grenoble, France
09.04.2018
10.04.2018
Giovanni Bruno
Tobias Thiede
Tatiana Mishurova
Arne Kromm
Naresh Nadammal
Johannes Bode
Sandra Cabeza
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
SLM
eng
uncontrolled
Residual stress
eng
uncontrolled
In718
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.2 Versuchsanlagen und Prüftechnik
9.4 Integrität von Schweißverbindungen
Material
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
5.0 Abteilungsleitung und andere
Additive Fertigung
45100
2018
eng
3038
3046
7
49A
article
Springer Sciences & Business Media
New York, NY
1
--
--
--
The influence of the support structure on residual stress and distortion in SLM Inconel 718 parts
The effect of support structure and of removal from the base plate on the residual stress state in selective laser melted IN718 parts was studied by means of synchrotron X-ray diffraction. The residual stresses in subsurface region of two elongated prisms in as-built condition and after removal from the base plate were determined. One sample was directly built on a base plate and another one on a support structure. Also, the distortion on the top surface due to stress release was measured by contact profilometry. High tensile residual stress values were found, with pronounced stress gradient along the hatching direction. In the sample on support, stress redistribution took place after removal from the base plate, as opposed to simple stress relaxation for the sample without support. The sample on support structure showed larger distortion compared to sample without support. We conclude that the use of a support decreases stress values but stress-relieving heat treatments are still needed.
Metallurgical and materials transactions A
10.1007/s11661-018-4653-9
1073-5623
21.06.2018
Tatiana Mishurova
Sandra Cabeza
Tobias Thiede
Naresh Nadammal
Arne Kromm
Manuela Klaus
Christoph Genzel
Christoph Haberland
Giovanni Bruno
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
SLM
eng
uncontrolled
Residual stress
eng
uncontrolled
Synchrotron X-ray diffraction
eng
uncontrolled
IN718
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.4 Integrität von Schweißverbindungen
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
5.0 Abteilungsleitung und andere
Additive Fertigung
35175
2015
eng
287
293
647
article
Elsevier B.V.
Amsterdam
1
--
--
--
Reverse tension/compression asymmetry of a Mg-Y-Zn alloys containing LPSO phases
Room temperature mechanical behavior of extruded Mg–Y–Zn alloys with varying fractions of LPSO phase was studied in tension and compression along the extrusion direction. The microstructure is characterised by elongated LPSO fibers along the extrusion direction within the magnesium matrix. Moreover, the magnesium matrix presents a bimodal grain structure with dynamically-recrystallized grains and deformed, elongated grains with the basal plane parallel to the extrusion direction. The beginning of plasticity depends on the volume fraction of deformed and DRX grains. Alloys with low volume fraction of LPSO phase (<10 vol%), with a high volume fraction of deformed grains, show the typical behavior of extruded magnesium alloys where yield stress in tension is higher than in compression. This effect is, however, reversed as the volume fraction of the LPSO phase increases since DRX grains are majority.
Materials science and engineering A
38330
10.1016/j.msea.2015.09.003
0921-5093
1873-4936
21.12.2015
G. Garces
P. Perez
Sandra Cabeza
H. K. Lin
S. Kim
W. Gan
Paloma Adeva
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
35128
2015
deu
lecture
0
--
--
--
Characterization of Residual Stress State on Inert Gas Welded Joints by Neutron Diffraction at E3 line
BER Users Meeting
38281
BER Users Meeting
Berlin, Germany
2015-12-11
2015-12-11
0
Sandra Cabeza
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation
35129
2015
deu
lecture
0
--
--
--
3D Microstructure Characterization of Al MMC by means of Synchrotron Micro-Tomography at BAMline-Bessy II
BESSY Users Meeting
38282
BESSY Users Meeting
Berlin, Germany
2015-12-10
2015-12-10
0
Sandra Cabeza
Weder Datei noch physisches Exemplar vorhanden ("No Access")
Präsentation
43460
2017
eng
poster
0
--
--
--
The influence of the support structure on residual stress and distortion in SLM Inconel 718 parts
The effect of support structure and of removal from the base plate on the residual stress state in Selective Laser Melted IN718 parts was studied by means of synchrotron X-ray diffraction. The residual stresses in subsurface region of two elongated prisms in as-built condition and after the cutting from the base plate were determined. One sample was directly built on a base plate and another one on a support structure. Also, the distortion on the top surface due to stress release was measured by contact profilometry. High tensile residual stress values were found, with pronounced stress gradient along the hatching direction. In the sample on support stress redistribution took place after removal of the base plate, as opposed to simple stress relaxation for the sample without support. The sample on support structure showed larger distortion compared to sample without support. We conclude that the use of a support decreases stress values but stress relieving heat treatments are still needed.
User Meeting HZB 2018
Berlin, Germany
14.12.2017
Tatiana Mishurova
Tobias Thiede
Sandra Cabeza
Giovanni Bruno
Arne Kromm
Naresh Nadammal
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Residual stress
eng
uncontrolled
Synchrotron X-ray diffraction
Analytische Chemie
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
40572
2017
eng
10198
10216
17
52
article
Springer
1
--
--
--
Stress-induced damage evolution in cast AlSi12CuMgNi alloy with one- and two ceramic reinforcements
Two composites, consisting of an as-cast AlSi12CuMgNi alloy reinforced with 15%vol. Al2O3 short fibres and with 7%vol. Al2O3 short fibres + 15%vol. SiC particles were studied. Synchrotron computed tomography disclosed distribution, orientation, and volume fraction of the different phases. In-situ compression tests during neutron diffraction in direction parallel to the fibres plane revealed the load partition between phases. Internal damage (fragmentation) of the Si phase and Al2O3 fibres was directly observed in CT reconstructions. Significant debonding between Al-matrix and SiC particles was also found. Finally, based on the Maxwell scheme, a micro-mechanical model was utilized for the new composite with two ceramic reinforcements; it rationalizes the experimental data, and predicts the evolution of all internal stress components in each phase.
Journal of Material Science
10.1007/s10853-017-1182-7
0022-2461
1573-4803
07.07.2017
Sandra Cabeza
Tatiana Mishurova
G. Garces
G. Requena
Giovanni Bruno
I. Sevostianov
eng
uncontrolled
Computed tomography
eng
uncontrolled
Metal matrix composite
eng
uncontrolled
Load partition
eng
uncontrolled
Neutron diffraction
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
39279
2017
eng
Article UNSP 110010-1
10
1
1806
conferenceobject
AIP Publishing
Melville, NY 11747
American Institute of Physics
1
--
--
--
Evaluation of high spatial resolution imaging of magnetic stray fields for early damage detection
The paper discusses the evaluation of elastic and plastic strain states in two low-carbon steels of the same steel group with high spatial resolution GMR (giant magneto resistance) sensors. The residual stress distributions of tungsten inert gas welded plates were determined by means of neutron diffraction as a reference. The normal component of local residual magnetic stray fields arise in the vicinity of the positions of maximum stress. The experiments performed on flat tensile specimen indicate that the boundaries of plastic deformations are a source of stray fields. The spatial variations of magnetic stray fields for both the weld and the tensile samples are in the order of the earths magnetic field.
AIP Conference Proceeding
978-0-7354-1474-7
10.1063/1.4974688
0094-243X
43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36
Atlanta, Georgia, USA
17.07.2016
22.07.2016
07.07.2017
Robert Stegemann
Sandra Cabeza
Matthias Pelkner
Viktor Lyamkin
Nadja Sonntag
Giovanni Bruno
Birgit Skrotzki
Marc Kreutzbruck
eng
uncontrolled
Plastic deformation
eng
uncontrolled
GMR
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Residual stress
eng
uncontrolled
Microstructure
eng
uncontrolled
Low carbon steel
eng
uncontrolled
TIG weld
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Ingenieurbau
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
39575
2017
eng
Article 348, 1
14
4
10
article
1
--
--
--
An Assessment of Subsurface Residual Stress Analysis in SLM Ti-6Al-4V
Ti-6Al-4V bridges were additively fabricated by selective laser melting (SLM) under different scanning speed conditions, to compare the effect of process energy density on the residual stress state. Subsurface lattice strain characterization was conducted by means of synchrotron diffraction in energy dispersive mode. High tensile strain gradients were found at the frontal surface for samples in an as-built condition. The geometry of the samples promotes increasing strains towards the pillar of the bridges. We observed that the higher the laser energy density during fabrication, the lower the lattice strains. A relief of lattice strains takes place after heat treatment.
Materials
10.3390/ma10040348
urn:nbn:de:kobv:b43-395759
1996-1944
22.06.2017
Creative Commons - Namensnennung
Tatiana Mishurova
Sandra Cabeza
Katia Artzt
J. Haubrich
M. Klaus
Ch. Genzel
G. Requena
Giovanni Bruno
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Heat treatment
eng
uncontrolled
Ti-6Al-4V
eng
uncontrolled
Synchrotron X-ray diffraction
eng
uncontrolled
Residual stress
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei für die Öffentlichkeit verfügbar ("Open Access")
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/39575/materials-10-00348.pdf
45855
2018
eng
66,1
18
3
37
article
Springer US
New York
1
--
--
--
Influence of the microstructure on magnetic stray fields of low-carbon steel welds
This study examines the relationship between the magnetic mesostructure with the microstructure of low carbon steel tungsten inert gas welds. Optical microscopy revealed variation in the microstructure of the parent material, in the heat affected and fusion zones, correlating with distinctive changes in the local magnetic stray fields measured with high spatial resolution giant magneto resistance sensors. In the vicinity of the heat affected zone high residual stresses were found using neutron diffraction.
Notably, the gradients of von Mises stress and triaxial magnetic stray field modulus follow the same tendency transverse to the weld. In contrast, micro-X-ray fluorescence characterization indicated that local changes in element composition had no independent effect on magnetic stray fields.
Journal of Nondestructive Evaluation
10.1007/s10921-018-0522-0
0195-9298
1573-4862
06.09.2018
Robert Stegemann
Sandra Cabeza
Matthias Pelkner
Viktor Lyamkin
Andreas Pittner
Daniel Werner
R. Wimpory
M. Boin
Marc Kreutzbruck
Giovanni Bruno
eng
uncontrolled
TIG-welding
eng
uncontrolled
GMR sensors
eng
uncontrolled
Magnetic stray field
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Residual stress
eng
uncontrolled
Microstructure
eng
uncontrolled
Low carbon steel
Analytische Chemie
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe
5.2 Metallische Hochtemperaturwerkstoffe
7 Bauwerkssicherheit
7.1 Baustoffe
8 Zerstörungsfreie Prüfung
8.4 Akustische und elektromagnetische Verfahren
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.3 Schweißtechnische Fertigungsverfahren
Material
Degradation von Werkstoffen
Chemie und Prozesstechnik
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
42218
2017
deu
177
178
conferenceobject
Deutsche Gesellschaft für Materialkunde eV
0
--
--
--
Synchrotron-Absorptionskantentomographie zur dreidimensionalen Gefügeuntersuchung von Mg-Y-Zn Legierungen
Absorptionskantentomographie, auch bekannt als differentielle Tomographie an Kanten, ist ein Verfahren, bei dem ausgenutzt wird, dass sich die Schwächung von Röntgenstrahlen beim Übergang der Photonenenergie über die Absorptionskanten sprunghaft ändert. Die Verwendung von Synchrotronstrahlung ermöglicht die Anwendung der Absorptionskantentomographie für nahezu jedes Element, da sie eine intensive, durchstimmbare Strahlenquelle mit kleiner Bandbreite darstellt. Der Mikrotomographieaufbau der BAM am Elektronenspeicherring BESSY II eignet sich mit einem Energiebereich von 5 keV bis über 60 keV und einer Ortsauflösung besser als 0.5 µm zur differentiellen Tomographie an den K-Kanten der Elemente von Chrom bis zu den Lanthaniden, bei Einbeziehung der L-Kante bis zu Uran.
In dieser Arbeit wird die Absorptionskantentomographie ausgenutzt, um das Gefüge von Legierungen dreidimensional und nichtdestruktiv zu vermessen. Als Beispiel wird eine Legierung zwischen Magnesium, Yttrium und Zink analysiert, die sich gegenüber unlegiertem Magnesium durch größere Festigkeit und geringere Korrosionsanfälligkeit auszeichnet. Der Grund dafür liegt in der Bildung einer kristallographisch hochgeordneten Phase (long period stacking ordered - LPSO) der Legierungsbestandteile, die die Matrix in Form von Fasern durchzieht. Anhand ihres Yttriumgehaltes wird die dreidimensionale Verteilung der LPSO-Phase in der Matrix für verschiedene Proben bestimmt und mit Schnittbildern und Korrosionstests verglichen. Die Absorptionskantentomographie erweist sich als eine geeignete Methode, um die dreidimensionale Mikrostruktur von Legierungen zu charakterisieren.
Fortschritte in der Metallographie
978-3-88355-415-0
51. Metallographie-Tagung Materialographie
Aalen, Germany
13.09.2017
15.09.2017
Christian Gollwitzer
Sandra Cabeza
G. Garces
deu
uncontrolled
Tomographie
deu
uncontrolled
Absorptionskante
deu
uncontrolled
Synchrotron
deu
uncontrolled
Legierung
Analytische Chemie
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Graue Literatur
42935
2017
eng
5332
5343
11
48A
article
Spinger
1
--
--
--
Effect of Extrusion Temperature on the Plastic Deformation of an Mg-Y-Zn Alloy Containing LPSO Phase Using In Situ Neutron Diffraction
The evolution of the internal strains during in situ tension and compression tests has been
measured in an MgY2Zn1 alloy containing long-period stacking ordered (LPSO) phase using
neutron diffraction. The alloy was extruded at two different temperatures to study the influence
of the microstructure and texture of the magnesium and the LPSO phases on the deformation
mechanisms. The alloy extruded at 623 K (350 °C) exhibits a strong fiber texture with the basal
plane parallel to the extrusion direction due to the presence of areas of coarse non-recrystallised
grains. However, at 723 K (450 °C), the magnesium phase is fully recrystallised with grains
randomly oriented. On the other hand, at the two extrusion temperatures, the LPSO phase
orients their basal plane parallel to the extrusion direction. Yield stress is always slightly higher
in compression than in tension. Independently on the stress sign and the extrusion temperature,
the beginning of plasticity is controlled by the activation of the basal slip system in the dynamic
recrystallized grains. Therefore, the elongated fiber-shaped LPSO phase which behaves as the
reinforcement in a metal matrix composite is responsible for this tension–compression asymmetry.
Metallurgical and Materials Transactions A
10.1007/s11661-017-4284-6
16.11.2017
Sandra Cabeza
G. Garces
Paloma Adeva
S. Kabra
W. Gan
eng
uncontrolled
Mg-Y-Zn Alloy
eng
uncontrolled
LPSO Phase
eng
uncontrolled
Neutron Diffraction
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
42936
2017
eng
136
148
92
article
Elsevier Ltd.
1
--
--
--
Experimental studies of the magneto-mechanical memory (MMM) technique using permanently installed magnetic sensor arrays
The magneto-mechanical memory (MMM) method, that is often referred to as the metal magnetic memory method, has been reported to be a non-destructive testing technique capable of quantifying stress concentrations and detecting defects in ferromagnetic materials. The underlying mechanism behind MMM has been explained in the literature, but the sensitivity to stress concentration has not been satisfactorily investigated. In this paper, both the normal and tangential components of the stress-induced MMM signal were measured by permanently installed magnetic sensor arrays on specimens made from three grades of L80 alloy steel and 20 other structural steels; tests were also carried out on a pipe made from the 4140-L80 steel. As expected, the stress history affects the MMM signal, but the experimental results show that significant irreversible change of magnetization always occurs only in the first cycle of loading regardless whether the deformation is purely elastic or partially plastic. If the peak stress level is increased at a given point during cycling, the immediately following next cycle acts as a new “first” cycle at that peak stress level and causes additional significant irreversible change of magnetization, but there is no evidence that plastic deformation might build up a cumulative magnetization. The MMM effect is very small in the steel samples tested, indicating that it will not be useful in field applications. In un-notched specimens the irreversible change in magnetization caused a proportional change in the measured external magnetic field on the order of only 5–10 A/m, while in the case of notched specimens the leakage field was on the order of 30–60 A/m.
NDT & E International
10.1016/j.ndteint.2017.07.019
0963-8695
1879-1174
24.11.2017
Sandra Cabeza
P. Cawley
Z. Li
S. Dixon
R. Jarvis
P. B. Nagy
eng
uncontrolled
Magneto-mechanical memory
eng
uncontrolled
Stress concentration
eng
uncontrolled
Permanently installed sensors
eng
uncontrolled
Irreversible change
eng
uncontrolled
Cumulative magnetization
Analytische Chemie
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
45927
2018
eng
453
464
736
article
Elsevier B.V.
1
--
--
--
The role of intermetallics in stress partitioning and damage evolution of AlSi12CuMgNi alloy
Load partitioning between phases in a cast AlSi12CuMgNi alloy was investigated by in-situ compression test during neutron diffraction experiments. Computed tomography (CT) was used to determine volume fractions of eutectic Si and intermetallic (IM) phases, and to assess internal damage after ex-situ compression tests. The CT reconstructed volumes showed the interconnectivity of IM phases, which build a 3D network together with eutectic Si. Large stresses were found in IMs, revealing their significant role as a reinforcement for the alloy. An existing micromechanical model based on Maxwell scheme was extended to the present case, assuming the alloy as a three-phase composite (Al matrix, eutectic Si, IM phases). The model agrees well with the experimental data.
Moreover, it allows predicting the principal stresses in each phase, while experiments can only determine stress differences between the axial and radial sample directions. Finally, we showed that the addition of alloying elements not only allowed developing a 3D interconnected network, but also improved the strength of the Al matrix, and the ability of the alloy constituents to bear mechanical load.
Materials Science & Engineering A
10.1016/j.msea.2018.08.070
01.11.2018
Sergei Evsevleev
Tatiana Mishurova
Sandra Cabeza
R. Koos
I. Sevostianov
G. Garces
G. Requena
R. Fernández
Giovanni Bruno
eng
uncontrolled
Aluminum alloys
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Micromechanical modeling
eng
uncontrolled
Internal stress
eng
uncontrolled
Computed tomography
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
Material
Degradation von Werkstoffen
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
41606
2017
eng
139
150
134
article
Elsevier
Oxford, UK
1
--
--
--
Effect of hatch length on the development of microstructure, texture and residual stresses in selective laser melted superalloy Inconel 718
In the present study, samples fabricated by varying the deposition hatch length during selective laser melting of nickel based superalloy Inconel 718 were investigated. Microstructure and texture of these samples was characterized using scanning electron microscopy, combined with electron back-scattered diffraction, and residual stress assessment, using neutron diffraction method. Textured columnar grains oriented along the sample building direction were observed in the shorter hatch length processed sample. A ten-fold increase in the hatch length reduced the texture intensity by a factor of two attributed to the formation of finer grains in the longer hatch length sample. Larger gradients of transverse residual stress in the longer hatch length sample were also observed. Along the build direction, compressive stresses in the shorter hatch length and negligible stresses for the longer hatch length specimen were observed. Changes to the temperature gradient (G) in response to the hatch length variation, influenced the G to growth rate (R) ratio and the product G × R, in agreement with the microstructures and textures formed. For the residual stress development, geometry of the part also played an important role. In summary, tailored isotropy could be induced in Inconel 718 by a careful selection of parameters during selective laser melting.
Materials and Design
10.1016/j.matdes.2017.08.049
http://www.sciencedirect.com/science/article/pii/S0264127517308018
0264-1275
13.10.2017
Naresh Nadammal
Sandra Cabeza
Tatiana Mishurova
Tobias Thiede
Arne Kromm
Christoph Seyfert
Lena Farahbod
Christoph Haberland
Judith Ann Schneider
Pedro Dolabella Portella
Giovanni Bruno
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Nickel-based superalloy
eng
uncontrolled
Microstructure and texture
eng
uncontrolled
Residual stress
eng
uncontrolled
Electron back-scattered diffraction
eng
uncontrolled
Neutron diffraction
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
42033
2017
eng
lecture
0
--
--
--
Residual stress fields in AM Ni-718 in as built and after release from baseplate
The residual stress distribution of IN718 parts produced by Selective Laser Melting (SLM) technique was studied by means of neutron diffraction.
Two deposition hatching lengths were considered in the fabrication. Both lateral (building direction) and top (finishing) near-surface regions were characterized. Measurements on samples in as-built condition and after release from the plate proved the presence of stress gradients both in-plane and along the building direction.
As-built samples presented in top region a longitudinal stress relief for large hatching, whereas small one showed tensile stresses around (200MPa) in the middle, evolving towards compression at the tip of the sample (down to -300MPa). Towards the lateral edge, longitudinal stresses shifted also to compression. The transverse stresses for large hatching were relief in the middle, whereas for small hatching shifted to compression at the edge. As for the normal component, this was more homogenous: stress-relief was proved for large hatching and, in contrast, was in compression (-200MPa) for small hatching. In the building direction (lateral region from base plate to top) of the sample with large hatching all stress components showed tensile values near the base plate (particularly high for normal component around 300MPa), decreasing towards compression to the top, where they were almost released.
After release, in the top region, the longitudinal stress component for small hatching showed high compressive stresses in the central part (down to -250MPa). In contrast, for large hatching a stress relief was found. In the transversal direction, this behavior was inverted: a small hatching released stresses more effectively, while a large hatching presented high tensile stresses (around 200MPa). As for the normal component (i.e., building direction), the sample with small hatching was found in compression, while that with large hatching was stress-released or slightly in tension (around 100MPa). In the lateral surface region, all components showed similar behavior: a small hatching promoted high compressive stresses along the building direction, whereas a large hatching showed small tensile values at the bottom, which balance towards the top region. There is an overall shift of stresses in 3 directions towards tension when compared with as-built condition for top region. In contrast, the lateral region is stress-relief or shifted towards compression after cutting from baseplate.
In conclusion, hatching length parameter strongly influenced the 3D distribution of residual stress in SLM produced parts.
MECA SENS 2017
Skukuza, South Africa
19.09.2017
21.09.2017
0
Sandra Cabeza
eng
uncontrolled
Residual stress
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Neutron diffraction
Ingenieurwissenschaften und zugeordnete Tätigkeiten
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Präsentation
47921
2018
eng
1
154
report
0
--
--
--
A novel approach for rating fatigue-initiating inclusions in highly demanding steel (INCAFAT)
INCAFAT project aimed to improve existing fatigue damage models by establishing the most suitable combination of measurement techniques to characterise harmful inclusion populations in highly demanding steels. The different inclusion assessments carried out confirm that, chemical composition, secondary metallurgy and manufacturing route affect content, nature, size and shape of inclusions. According to the FEM model, inclusions produce an alteration of the stress field in their surrounding region, which can promote a fatigue failure. Experimental work on fatigue testing has demonstrated that depending on the stressed direction fatigue failures in highly demanding steels could be produced by different types of inclusions. Fractography analyses confirmed that meso-inclusions harmful in fatigue cannot be rated by standard methods, nor 10 MHz ultrasonic testing (macro) or micro-cleanness assessments. The necessity of rating these meso-inclusions has led to critical evaluation of Extreme Value Analysis according to ASTM E2283-08 and the development of high frequency immersion ultrasonic testing. EVA methodology based on inclusion width can be applied reliably when principal stress is parallel to the rolling direction. On the contrary, if inclusions are testing in the elongated directions its fails. On the other hand, the guidelines and recommendations for high frequency ultrasonic testing have been compiled in a new European standard draft. This method based on focal beam probes and high-resolution devices is able to provide information on meso-inclusion distribution.
EU publications
978-92-79-76985-6
10.2777/473350
https://publications.europa.eu/en/publication-detail/-/publication/6bd25206-316a-11e8-b5fe-01aa75ed71a1/language-en/format-PDF/source-68610160
1831-9424
1018-5593
urn:nbn:de:kobv:b43-479219
false
true
Creative Commons - CC BY - Namensnennung 4.0 International
M. Pérez Alonso
J. Albarrán Sanz
M. Dinkel
Thomas Heckel
Daniel Kotschate
Sandra Cabeza
J. Senaneuch
I. Heikkila
O. Toscanelli
eng
uncontrolled
Material characterisation
eng
uncontrolled
Non-destructive testing
eng
uncontrolled
Ultrasonic testing
eng
uncontrolled
Cleanliness
Analytische Chemie
8 Zerstörungsfreie Prüfung
8.4 Akustische und elektromagnetische Verfahren
8.5 Röntgenbildgebung
Chemie und Prozesstechnik
Datei für die Öffentlichkeit verfügbar ("Open Access")
Graue Literatur
Wissenschaftliche Artikel der BAM
Bundesanstalt für Materialforschung und -prüfung (BAM)
https://opus4.kobv.de/opus4-bam/files/47921/KINA28902ENN.en.pdf