TY - GEN A1 - Epishin, Alexander A1 - Brückner, Udo A1 - Link, T. A1 - Portella, Pedro Dolabella ED - Dias, A. T1 - Investigation of stresses in superalloys by analysis of y/y'-Microstructure T2 - 6th European Conference on Residual Stresses CY - Coimbra, Portugal DA - 2002-07-10 KW - Superalloys KW - Stress KW - Misfit KW - Rafting PY - 2002 SN - 0-87849-900-8 SN - 0255-5476 N1 - Serientitel: Materials science forum – Series title: Materials science forum IS - 404/407 SP - 287 EP - 292 PB - Trans Tech Publ. CY - Uetikon-Zuerich AN - OPUS4-7147 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brückner, Udo A1 - Epishin, Alexander A1 - Link, T. A1 - Portella, Pedro Dolabella ED - Böttger, A. T1 - Creep induced evolution of internal stresses and structure in a single crystal nickel-base superalloy N2 - Changes in the structure of single-crystal (SC) superalloy SRR99 during creep at 980 °C and 200 MPa were investigated. Geometrical parameters of the y/y'-microstructure, y/y'-misfit, stresses in the phases and local misorientation of the structure were determined at defined points of the dendritic structure by use of X-ray diffraction (XRD), wavelength dispersive X-ray spectroscopy (WDXS), scanning (SEM) and transmission (TEM) electron microscopy. Correlation of the microstructural period and local misorientation of the structure with creep strain were found. T2 - 5th European Conference on Residual Stresses CY - Delft-Noordwijkerhout, the Netherlands DA - 1999-10-28 KW - Creep KW - Dendrite KW - Misfit KW - Segregation KW - Superalloys PY - 2000 UR - http://cat.inist.fr/?aModele=afficheN&cpsidt=1381837 SN - 0-87849-855-9 SN - 0255-5476 N1 - Serientitel: Materials science forum – Series title: Materials science forum IS - 347/349 SP - 363 EP - 367 PB - Trans Tech Publ. CY - Uetikon-Zürich AN - OPUS4-7151 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Epishin, Alexander A1 - Link, T. A1 - Portella, Pedro Dolabella A1 - Brückner, Udo T1 - Evolution of the gamma/gamma'-microstructure during high-temperature creep of a nickel-base superalloy KW - Nickel alloys KW - Creep KW - Mesostructure KW - Scanning electron microscopy (SEM) KW - Image analysis PY - 2000 SN - 1359-6454 SN - 1873-2453 VL - 48 SP - 4169 EP - 4177 PB - Elsevier Science CY - Kidlington AN - OPUS4-7152 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Portella, Pedro Dolabella A1 - Österle, Werner A1 - Jiao, F. A1 - Ziebs, Josef ED - Aldinger, F. T1 - Mechanisches Verhalten der Legierung 800H unter zyklischer zweiachsiger Beanspruchung T2 - Werkstoffwoche '96 (WW) CY - Stuttgart, Deutschland DA - 1996-05-28 PY - 1997 SN - 3-88355-235-6 N1 - Serientitel: Werkstoffwoche '96 Symposium – Series title: Werkstoffwoche '96 Symposium IS - 7 SP - 361 EP - 366 PB - DGM Informationsges. CY - Frankfurt AN - OPUS4-2637 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Aurich, Dietmar A1 - Österle, Werner A1 - Portella, Pedro Dolabella A1 - Ziebs, Josef T1 - Werkstoffprüfung einkristalliner Superlegierungen für Turbinenschaufeln T2 - Symposium Materialforschung CY - Bonn, Deutschland PY - 1988 IS - 8 SP - 358 EP - 367 CY - Bonn AN - OPUS4-2455 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Aurich, Dietmar A1 - Helms, Rolf A1 - Österle, Werner A1 - Portella, Pedro Dolabella A1 - Ziebs, Josef T1 - Untersuchungen an einkristallinen Superlegierungen für Turbinenschaufeln T2 - VDEh-Vortragsveranstaltung "Stähle für den Stahlbau" CY - Düsseldorf, Deutschland DA - 1988-04-26 PY - 1988 SN - 3-514-00407-2 SP - 140 EP - 150 PB - Verl. Stahleisen CY - Düsseldorf AN - OPUS4-2456 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Epishin, Alexander A1 - Brückner, Udo A1 - Portella, Pedro Dolabella A1 - Link, T. T1 - Influence of small rhenium additions on the lattice spacing of nickel solid solution N2 - The influence of small rhenium additions on the lattice spacing of a nickel solid solution was investigated using a nickel–rhenium single crystal with an axial macrosegregation of rhenium. The effect of rhenium on the lattice spacing of the nickel solid solution was found to be similar to that of tungsten. KW - Nickel alloys KW - Crystallography PY - 2003 DO - https://doi.org/10.1016/S1359-6462(02)00436-0 SN - 1359-6462 SN - 1872-8456 VL - 48 IS - 4 SP - 455 EP - 459 PB - Elsevier CY - Oxford AN - OPUS4-2278 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Jiao, Feng A1 - Österle, Werner A1 - Portella, Pedro Dolabella A1 - Ziebs, Josef T1 - Biaxial path-dependence of low-cycle fatigue behaviour and microstructure of alloy 800 H at room temperature N2 - Low-cycle fatigue experiments under combined axial-torsional loading have been carried out on alloy 800 H tubular specimens at room temperature. In comparison with proportional loading, an extra cyclic hardening effect produced by nonproportional loading was observed. The microstructure study highlights the fact that the dislocation arrangement under proportional loading is significantly different from that under nonproportional loading. Mechanical twinning was found in specimens cycled under axial loading and nonproportional loading. It is suggested that mechanical twinning depends not only on shear stress but also on normal stress on the plane of maximum shearing. The extra hardening can be interpreted in terms of the deformation microstructure. Fatigue cracking was initiated generally at the specimen surfaces along the plane of maximum shearing, but under nonproportional loading cracks were found also in the bulk of the specimens. Transcrystalline crack propagation was observed in the specimens after proportional and nonproportional LCF tests. PY - 1995 DO - https://doi.org/10.1016/0921-5093(94)09690-2 SN - 0921-5093 SN - 1873-4936 VL - 196 IS - 1 SP - 19 EP - 24 PB - Elsevier CY - Amsterdam AN - OPUS4-2503 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Influence of high temperature creep damage on low cycle fatigue of CMSX-4 T2 - International Conference on Materials Science & Technology (MS&T '05) CY - Pittsburgh, PA, USA DA - 2005-09-25 PY - 2005 AN - OPUS4-12178 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Peters, P. W. M. A1 - Hemptenmacher, J. A1 - Günther, Burkhard A1 - Bettge, Dirk A1 - Portella, Pedro Dolabella ED - Galiotis, C. T1 - Analysis of the thermo-mechanical fatigue behaviour of SiC-fibre reinforced titanium alloy (SCS-6/TI-6242) T2 - 11th European Conference on Composite Materials (ECCM-11) CY - Rhodos (Greece) DA - 2004-05-31 KW - Ti-MMC KW - Ermüdung KW - Schädigungsmechanik PY - 2004 VL - 2 SP - 1 EP - 8 CY - Rhodos, Greece AN - OPUS4-11102 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bettge, Dirk A1 - Günther, Burkhard A1 - Wedell, Wolfgang A1 - Portella, Pedro Dolabella A1 - Hemptenmacher, J. A1 - Peters, P. W .M. ED - Portella, Pedro Dolabella T1 - Fatigue damage of a SiC fibre reinforced titanium matrix composite T2 - 5th International Conference on Low Cycle Fatigue (LCF-5) CY - Berlin, Germany DA - 2003-09-09 KW - Metal matrix composite KW - Thermo-mechanical fatigue KW - Damage analysis PY - 2003 VL - 5 SP - 81 EP - 86 PB - DVM, Deutscher Verband für Materialforschung und -prüfung CY - Berlin AN - OPUS4-11103 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bettge, Dirk A1 - Günther, Burkhard A1 - Wedell, Wolfgang A1 - Portella, Pedro Dolabella A1 - Hemptenmacher, J. A1 - Peters, P. W. M. ED - Lütjering, G. T1 - Quantitative Analysis of the Fatigue Damage of Ti-6242/SCS-6 Metal Matrix Composite T2 - 10th World Conference on Titanium CY - Hamburg, Germany DA - 2003-07-13 KW - Ti-MMC KW - Ermüdung KW - Schädigungsmechanik PY - 2003 SN - 3-527-30306-5 VL - 4 SP - 2577 EP - 2584 PB - Wiley-VCH CY - Weinheim AN - OPUS4-11105 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bettge, Dirk A1 - Günther, Burkhard A1 - Wedell, Wolfgang A1 - Portella, Pedro Dolabella A1 - Hemptenmacher, J. A1 - Peters, P.W.M. T1 - Fatigue Mechanisms of a SiC Fibre Reinforced Titanium Matrix Composite T2 - 15. Symposium Verbundwerkstoffe und Werkstoffverbunde CY - Kassel, Deutschland DA - 2005-04-06 KW - Ti-MMC KW - Ermüdung KW - Schädigungsmechanik PY - 2005 SP - 519 EP - 524 PB - DGM CY - Kassel AN - OPUS4-11106 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bettge, Dirk A1 - Günther, Burkhard A1 - Wedell, Wolfgang A1 - Portella, Pedro Dolabella A1 - Hemptenmacher, J. A1 - Schurmann, H. T1 - Fatigue behaviour of a titanium matrix composite T2 - Materials Week 2002 ; European Congress on Advanced Materials, their Processes and Applications ; 6th International Conference on Joining Ceramics, Glass and Metal CY - Munich, Germany DA - 2002-09-30 KW - Ti-MMC KW - Ermüdung KW - Schädigungsmechanik PY - 2002 SN - 3-88355-314-X PB - Werkstoff-Informationsges. AN - OPUS4-11108 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Bettge, Dirk A1 - Günther, Burkhard A1 - Wedell, Wolfgang A1 - Portella, Pedro Dolabella A1 - Hemptenmacher, J. A1 - Peters, P. W. M. ED - Pandey, A. B. T1 - Fatigue Damage of Ti-6242/SCS-6 Metal Matrix Composite T2 - 2nd Affordable metal matrix composites for high-performance applications ; Materials Science & Technology Meeting CY - Chicago, IL, USA DA - 2003-11-09 KW - Ti-MMC KW - Ermüdung KW - Schädigungsmechanik PY - 2003 SN - 0-87339-557-3 SP - 81 EP - 90 PB - TMS CY - Warrendale, Pa. AN - OPUS4-11666 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Epishin, Alexander A1 - Link, T. A1 - Brückner, Udo A1 - Klingelhöffer, Hellmuth A1 - Portella, Pedro Dolabella T1 - The effect of high temperature creep damage on low cycle fatigue of CMSX-4 T2 - 8th Liège Conference "Materials for Advanced Power Engineering 2006" CY - Liege, Belgium DA - 2006-01-01 KW - Superalloys KW - CMSX-4 KW - Single crystal KW - Creep KW - Fatigue PY - 2006 SN - 3-89336-436-6 N1 - Serientitel: Schriften des Forschungszentrums Jülich - Reihe Energietechnik / Energy Technology – Series title: Schriften des Forschungszentrums Jülich - Reihe Energietechnik / Energy Technology IS - 53 SP - 317 EP - 325 PB - Forschungszentrum Jülich CY - Jülich AN - OPUS4-13701 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Adolf Martens and his contributions to materials engineering T2 - Invited plenary lecture, 7th European Symposium on Martensitic Transformations and Shape Memory Alloys - ESOMAT 2006 CY - Bochum, Germany DA - 2006-09-11 PY - 2006 AN - OPUS4-14612 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Vibration Induced Failure of Heat Exchanger T2 - Failure Analysis: Optimizing Design and Preventing Failures through Failure Analysis: Power and Energy Generation, Duke Energy Center CY - Cincinnati, OH, USA DA - 2006-10-17 PY - 2006 AN - OPUS4-14617 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Munster electric transmission tower failures T2 - Failure analysis: optimizing design and preventing failures through failure analysis: power and energy generation CY - Cincinnati, OH, USA DA - 2006-10-17 PY - 2006 AN - OPUS4-14674 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Characterization of single crystal nickel-base superalloys for gas turbine applications T2 - Arizona State University, Department of Chemical and Materials Engineering CY - Phoenix, AZ, USA DA - 2006-02-12 PY - 2006 AN - OPUS4-14815 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Einkristalline Nickelbasis-Superlegierungen und ihr Einsatz in Gasturbinen T2 - IMW-Seminar, Leibniz-Institut für Festkörper- und Werkstoffforschung CY - Dresden, Germany DA - 2007-02-01 PY - 2007 AN - OPUS4-14786 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - The activities of the German Working Group "Materials Science and Material Technology" T2 - BMBF Symposium "Korea and Germany: Partners in Research and Development" CY - Seoul, South Korea DA - 2006-11-01 PY - 2006 AN - OPUS4-14787 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Mechanical behaviour of single crystal superalloys under cyclic loading T2 - 6th Hungarian Materials Science Conference CY - Siófok, Hungary DA - 2007-10-14 PY - 2007 AN - OPUS4-14961 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Werkstoffaspekte bei der Auslegung von Windenergietürmen T2 - VDI-Fachkonferenz "Turm und Fundament von Windenergieanlagen" CY - Hamburg, Germany DA - 2011-10-12 PY - 2011 AN - OPUS4-24667 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Schadensanalyse an Eisenbahnkomponenten T2 - Seminarvortrag am Institut für Werkstofftechnik, Universität Kassel CY - Kassel, Germany DA - 2011-01-27 PY - 2011 AN - OPUS4-24668 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Mit Sicherheit innovativ: Der Beitrag der Werkstofftechnik T2 - Ehrenkolloquium für Prof. Bernhard Wielage, Technische Universität Chemnitz CY - Chemnitz, Germany DA - 2011-09-01 PY - 2011 AN - OPUS4-24669 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Aerogeradores offshore: problems e possíveis soluções T2 - Plenarvortrag, Dia dos Materiais 2011 CY - Lisbon, Portugal DA - 2011-11-02 PY - 2011 AN - OPUS4-24674 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - De Araújo, A. A1 - Panossian, Z. A1 - Portella, Pedro Dolabella A1 - Bäßler, Ralph T1 - Monitoramento da corrosao em estruturas de concreto: sensor galvânico N2 - O monitoramento das estruturas de concreto possibilita que o risco de corrosão seja estimado ao longo dos anos de sua utilização. Com o conhecimento desse risco, intervenções de prevenção da corrosão ou de controle da corrosão já estabelecida podem ser programadas e realizadas em períodos adequados. Na prática, o risco de corrosão é avaliado por meio da verificação periódica do estado da armadura e das alterações nas propriedades do concreto. Isso pode ser feito por meio do embutimento no concreto de cobrimento de sensores de aquisição contínua de dados. Há diferentes tipos de sensores de aquisição contínua de dados. Um dos mais conhecidos é o sensor galvânico que consta de um conjunto de barras de aço-carbono, eletricamente isoladas. Com o embutimento do sensor, essas barras ficam posicionadas em diferentes e conhecidas profundidades do concreto de cobrimento da armadura. O risco de corrosão da armadura é monitorado com a periódica medição da corrente galvânica em cada uma das barras do sensor. Essa medição, dentre outras informações do sensor galvânico foram abordadas em artigo anterior. Além do sensor galvânico, destacam-se o sensor de umidade e o de taxa de corrosão, que monitoram parâmetros importantes relacionados ao estabelecimento e evolução de processo corrosivo das armaduras. A seguir esses sensores são apresentados, bem como o sensor de fibra óptica, o qual apresenta algumas vantagens em relação aos demais mencionados, embora ainda seja de uso restrito. KW - Sensor da corrosao PY - 2013 SN - 0104-1053 VL - 194 IS - Maio SP - 62 EP - 66 PB - PINI AN - OPUS4-29403 LA - por AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - The contribution of the Platform MaterialDigital (PMD) in building up a Materials Data Space - Application to glass design and manufacturing N2 - Suitable material solutions are of key importance in designing and producing components for engineering systems – either for functional or structural applications. Materials data are generated, transferred, and introduced at each step along the complete life cycle of a component. A reliable materials data space is therefore crucial in the digital transformation of an industrial branch. A great challenge in establishing a materials data space lies in the complexity and diversity of materials science and engineering. It must be able to handle data from different knowledge areas over several magnitudes of length scale. The Platform MaterialDigital (PMD) is expected to network a large number of repositories of materials data, allowing the direct contact of different stakeholders as materials producers, testing labs, designers and end users. Following the FAIR principles, it will promote the semantic interoperability across the frontiers of materials classes. In the frame of a large joint initiative, PMD works intensively together with currently near 20 research consortia in promoting this exchange (www.material-digital.de). In this presentation we will describe the status of our Platform MaterialDigital. We will also present in more detail the activities of GlasDigital, one of the joint projects mentioned above dealing with the digitalization of glass design and manufacturing. (https://www.bam.de/Content/EN/Projects/GlasDigital/glasdigital.html) T2 - Onto Commons Workshop CY - Berlin, Germany DA - 04.04.2023 KW - Ontology KW - Data space PY - 2023 AN - OPUS4-58732 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Jiao, Feng A1 - Österle, Werner A1 - Portella, Pedro Dolabella A1 - Ziebs, Josef T1 - Cyclic hardening of alloy 800h under biaxial loading T2 - International Congress Stainless Steels '96 ; 2nd European congress CY - Düsseldorf and Neuss, Germany DA - 1996-06-03 KW - Hochtemperaturtechnik KW - Beanspruchung, zyklisch KW - Stahl, austenitisch KW - Legierung 800 H PY - 1996 SN - 3-514-00601-6 SP - 292 EP - 293 PB - Verl. Stahleisen CY - Düsseldorf AN - OPUS4-695 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Frenz, Holger A1 - Kinder, Joachim A1 - Klingelhöffer, Hellmuth A1 - Portella, Pedro Dolabella ED - Petit, J. T1 - Fracture of single crystal superalloys under cyclic loading at high temperatures T2 - 11th Biennial European Conference on Fracture (ECF) CY - Poitiers-Futuroscope, France DA - 1996-09-03 KW - Einkristall KW - Superlegierung KW - Hochtemperaturverhalten KW - Turbine PY - 1996 SN - 0-947817-92-1 VL - 2 SP - 1207 EP - 1213 PB - EMAS CY - Warley, West Midlands AN - OPUS4-699 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Frenz, Holger A1 - Gruhn, B. A1 - Dietrich, C. A1 - Lehmann, J. A1 - Krämer, E. A1 - Glaubitz, Steffen A1 - Wimmer, J. A1 - Rehmer, Birgit A1 - Kühn, Hans-Dieter A1 - Breitkreutz, Konrad A1 - Portella, Pedro Dolabella A1 - Hoffmann, E. A1 - Ziebs, Josef T1 - Sphäroguß als Werkstoff für Behälter zur Beförderung, Zwischen- und Endlagerung radioaktiver Stoffe; Untersuchung zu alternativen Eignungsnachweisen - Fachband 3: Werkstoffuntersuchungen, 1989 - 1992 N2 - Gußeisen mit Kugelgraphit und ferritischer bzw. ferritisch-perlitischer Matrix gehören zu einer Werkstoffgruppe, die ausreichende Festigkeiten mit hohen Duktilitäten verbindet. Mit der vorliegenden Arbeit wurden die Kenntnisse über die Zusammenhänge zwischen der chemischen Zusammensetzung, der Gefügeausbildung und den mechanischen Eigenschaften erweitert. Dabei wurden sowohl unterschiedliche Gießverfahren (Sand- und Kokillenguß) in der Herstellung, als auch die Auswirkungen von Umwandlungsprozessen im Gefüge infolge von Wärmebehandlungen diskutiert. Die statistische Auswertung von Einzelergebnissen aus der qualitätssichernden Begutachtung von Lager- und Transportbehältern für radioaktive Stoffe wurden durch mechanische und bruchmechanische Untersuchungen an 24 Werkstoffsorten aus Gußeisen mit Kugelgraphit ergänzt. KW - Eignungsnachweis KW - Endlagerung KW - Lagerbehälter KW - Radioaktiver Stoff KW - Sphäroguß (GGG-40) KW - Transportbehälter KW - Zwischenlagerung PY - 1992 N1 - Das Projekt wurde gefördert vom Bundesminister für Forschung und Technologie (BMFT); Förderkennzeichen: KWA 79052. SP - 1 EP - 178 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-59950 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - High power laser hybrid welding for ship building T2 - Welding Symposium, COTEQ 2011, 11a Conferencia de Tecnologia de Equipamentos CY - Ipojuca, Brazil DA - 2011-05-12 PY - 2011 AN - OPUS4-24673 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Frenz, Holger A1 - Kinder, Joachim A1 - Klingelhöffer, Hellmuth A1 - Portella, Pedro Dolabella T1 - Microstructural evolution and fracture mechanisms of single crystal superalloys under cyclic loading at high temperatures T2 - 17. Tagung des DVM-Arbeitskreises Rastermikroskopie in der Materialprüfung CY - Halle (Saale), Deutschland DA - 1996-03-27 KW - Einkristall KW - Superlegierung KW - Hochtemperatur PY - 1996 N1 - Serientitel: Tagung des DVM-Arbeitskreises Rastermikroskopie in der Materialprüfung – Series title: Tagung des DVM-Arbeitskreises Rastermikroskopie in der Materialprüfung IS - 17 SP - 275 EP - 280 PB - DVM, Geschäftsstelle CY - Berlin AN - OPUS4-665 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Portella, Pedro Dolabella A1 - Frenz, Holger A1 - Kinder, Joachim A1 - Bertram, Albrecht A1 - Fahlbusch, Erec ED - Lütjering, G. T1 - Cyclic behaviour of the single crystal superalloy SRR99 at 980 degrees C T2 - 6th International Fatigue Congress CY - Berlin, Germany DA - 1996-05-06 KW - Einkristall KW - Superlegierung KW - Hochtemperatur PY - 1996 SN - 0-08-042268-3 VL - 2 IS - 2 SP - 795 EP - 800 PB - Pergamon CY - Oxford AN - OPUS4-667 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Österle, Werner A1 - Portella, Pedro Dolabella A1 - Ziebs, Josef A1 - Jiao, Feng ED - Lütjering, G. T1 - Mechanical behaviour of alloy 800h under cyclic biaxial loading T2 - 6th International Fatigue Congress CY - Berlin, Germany DA - 1996-05-06 KW - Legierung KW - Belastung, zyklisch KW - Beanspruchung, mechanisch PY - 1996 SN - 0-08-042268-3 VL - 2 IS - 2 SP - 989 EP - 994 PB - Pergamon CY - Oxford AN - OPUS4-669 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kannengießer, Thomas A1 - Rethmeier, Michael A1 - Portella, Pedro Dolabella A1 - Ewert, Uwe A1 - Redmer, Bernhard T1 - Assessment of hot cracking behaviour in welds N2 - Hot crack assessment during production and processing of metallic materials is an essential prerequisite for the safety of welded structures. The hot cracking investigations presented here were carried out as part of a study aimed at the development of Cr/Ni low transformation temperature filler materials. Low transformation temperature alloys open up the possibility for welding high strength steels. The externally loaded Modified Varestraint Transvarestraint hot cracking test was employed in the experiments described. The hot cracking resistance was evaluated with the help of light microscopy applied at the specimen surface. The proportionality between hot cracking susceptibility and Cr/Ni alloy content was explained by the altered solidification kinetics and by the enlarged solidification interval. The internal crack paths and the three-dimensional structure of the crack net in the material volume were examined using X-ray computer tomography. The total crack lengths for different material depths and circumjacent rectangular volumes, respectively, were be determined. An increasing hot cracking susceptibility with increasing Cr/Ni alloy content was also be established for the specimen volume. KW - Hot cracking KW - Low transformation temperature (LTT) alloy KW - Modified varestraint transvarestraint (MVT) hot cracking test KW - X-ray computer tomography PY - 2011 DO - https://doi.org/10.3139/146.110545 SN - 1862-5282 VL - 102 IS - 8 SP - 1001 EP - 1006 PB - Carl Hanser CY - München AN - OPUS4-24400 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella A1 - Ulbricht, Alexander A1 - Evans, Alexander A1 - Altenburg, Simon A1 - Ehlers, Henrik A1 - Hilgenberg, Kai A1 - Mohr, Gunther T1 - Monitoring additive manufacturing processes by using NDT methods N2 - In this presentation we discuss the online monitoring of metallic AM parts produced by the Laser Powder Bed Fusion (LPBF) process by using optical, thermographic and electromagnetic methods. In a first approach we present the detection of defects generated during the process and discuss how to improve these methods for the optimization of design and production of metallic AM parts. T2 - ABENDI - Workshop CY - Online meeting DA - 19.11.2020 KW - Additive Fertigung PY - 2020 AN - OPUS4-52042 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Monitoring additive manufacturing N2 - Additive manufacturing (AM) processes allow a high level of freedom in designing and producing components for complex structures. They offer the possibility of a significant reduction of the process chain. However, the large number of process parameters influence the structure and the behavior of AM parts. A thorough understanding of the interdependent mechanisms is necessary for the reliable design and production of safe AM parts. In this presentation we discuss the online monitoring of metallic AM parts produced by the Laser Powder Bed Fusion (LPBF) process by using optical, thermographic and electromagnetic methods. In a first approach we present the detection of defects generated during the process and discuss how to improve these methods for the optimization of design and production of metallic AM parts. T2 - Conaendi&IEV 2021 CY - Online meeting DA - 10.03.2021 KW - Additive Fertigung PY - 2021 AN - OPUS4-52241 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - de Andrade Silva, F. A1 - Williams, J. J. A1 - Müller, Bernd R. A1 - Hentschel, Manfred P. A1 - Portella, Pedro Dolabella A1 - Chawla, N. T1 - Three-dimensional microstructure visualization of porosity and Fe-rich inclusions in SiC particle-reinforced Al alloy matrix composites by X-ray synchrotron tomography N2 - Microstructural aspects of composites such as reinforcement particle size, shape, and distribution play important roles in deformation behavior. In addition, Fe-rich inclusions and porosity also influence the behavior of these composites, particularly under fatigue loading. Three-dimensional (3-D) visualization of porosity and Fe-rich inclusions in three dimensions is critical to a thorough understanding of fatigue resistance of metal matrix composites (MMCs), because cracks often initiate at these defects. In this article, we have used X-ray synchrotron tomography to visualize and quantify the morphology and size distribution of pores and Fe-rich inclusions in a SiC particle-reinforced 2080 Al alloy composite. The 3-D data sets were also used to predict and understand the influence of defects on the deformation behavior by 3-D finite element modeling. KW - Synchrotron radiation KW - X-ray tomography KW - X-ray refraction KW - Analyser based imaging KW - Metal matrix composite (MMC) KW - Fatigue PY - 2010 DO - https://doi.org/10.1007/s11661-010-0260-0 SN - 1073-5623 SN - 1543-1940 VL - 41 IS - 8 SP - 2121 EP - 2128 PB - The Minerals, Metals and Materials Society CY - Warrendale AN - OPUS4-21629 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fedelich, Bernard A1 - Epishin, A. A1 - Link, T. A1 - Klingelhöffer, Hellmuth A1 - Künecke, Georgia A1 - Portella, Pedro Dolabella T1 - Experimental characterization and mechanical modeling of creep induced rafting in superalloys N2 - A constitutive model has been developed for the high temperature mechanical behavior of single crystal superalloys, including rafting and its consequences. The flow stress depends on the γ channel width via the Orowan stress. An evolution equation for channel widening during high temperature straining has been derived and calibrated with measurements. Therein, rafting is assumed to be driven by the relaxation of internal stresses. The model is able to represent the mechanical softening at high stresses consecutive to rafting. The model has been applied to simulate rafting during uniaxial creep in several crystal orientations, in notched specimens as well as in cyclically loaded specimens. KW - Single crystal KW - Superalloys KW - Rafting KW - Creep KW - Viscoplasticity KW - Constitutive law PY - 2012 DO - https://doi.org/10.1016/j.commatsci.2012.05.071 SN - 0927-0256 VL - 64 SP - 2 EP - 6 PB - Elsevier CY - Amsterdam AN - OPUS4-26401 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Epishin, Alexander A1 - Link, T. A1 - Klingelhöffer, Hellmuth A1 - Fedelich, Bernard A1 - Portella, Pedro Dolabella T1 - Creep damage of single-crystal nickel base superalloys: mechanisms and effect on low cycle fatigue N2 - The main mechanisms of creep damage of single-crystal nickel-base superalloys are the loss of the interface coherency, coarsening of the γ / γ'-microstructure, precipitation of topologically closed packed phases and growth of porosity. This degradation deteriorates the mechanical properties such as yield stress, creep lifetime and especially low-cycle fatigue life, which can be reduced nearly by a factor of 10. The degradation kinetics during creep was characterised quantitatively on the superalloy CMSX-4. A new non-destructive testing technique was applied to cover a wide test parameter range with few specimens in a relatively short time: repeated load annealing of wedge shaped specimens. KW - Creep damage KW - Nickel-base superalloys KW - Low-cycle fatigue KW - Rafting KW - Porosity KW - Prior exposure PY - 2010 DO - https://doi.org/10.3184/096034009X12603595726283 SN - 0960-3409 VL - 27 IS - 1 SP - 53 EP - 59 PB - Science Reviews CY - St. Albans, Herts. [u.a.] AN - OPUS4-23912 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fedelich, Bernard A1 - Künecke, Georgia A1 - Epishin, A. A1 - Link, T. A1 - Portella, Pedro Dolabella T1 - Constitutive modelling of creep degradation due to rafting in single-crystalline Ni-base superalloys N2 - A constitutive model for the mechanical behaviour of single-crystalline superalloys at high temperatures has been developed. The model relies on the slip system theory and is able to predict rafting and its influence on plastic flow. The kinetics of rafting are assumed to be driven by the reduction of the internal stresses represented by the macroscopic back-stress. The rafting effect is incorporated in the model through the dependence of the Orowan stress on the channel width. The model has been validated for the alloy CMSX-4 at 950 °C. The rafting part of the model has been calibrated by measurements of the channel widths after several levels of creep strains and for several loads. KW - Single crystal superalloy KW - Creep KW - Rafting KW - Constitutive modelling KW - Viscoplasticity PY - 2009 DO - https://doi.org/10.1016/j.msea.2008.04.089 SN - 0921-5093 SN - 1873-4936 VL - 510-511 SP - 273 EP - 277 PB - Elsevier CY - Amsterdam AN - OPUS4-19353 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nadammal, Naresh A1 - Kromm, Arne A1 - Saliwan Neumann, Romeo A1 - Farahbod, Lena A1 - Haberland, Christoph A1 - Portella, Pedro Dolabella T1 - Influence of support configurations on the characteristics of selective laser-melted Inconel 718 N2 - Samples fabricated using two different support configurations by following identical scan strategies during selective laser melting of superalloy Inconel 718 were characterized in this study. Characterization methods included optical microscopy, electron back-scattered diffraction and x-ray diffraction residual stress measurement. For the scan strategy considered, microstructure and residual stress development in the samples were influenced by the support structures. However, crystallographic texture intensity and the texture components formed within the core part of the samples were almost independent of the support. The formation of finer grains closer to the support as well as within the columnar grain boundaries resulted in randomization and texture intensity reduction by nearly half for the sample built on a lattice support. Heat transfer rates dictated by the support configurations in addition to the scan strategy influenced the microstructure and residual stress development in selective laser-melted Inconel 718 samples. KW - Additive manufacturing KW - Selective laser melting KW - Support configurations KW - Microstructure and texture KW - Residual stress PY - 2018 DO - https://doi.org/10.1007/s11837-017-2703-1 SN - 1047-4838 SN - 1543-1851 VL - 70 IS - 3 SP - 343 EP - 348 PB - Springer CY - USA AN - OPUS4-44175 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Epishin, A. A1 - Link, T. A1 - Klingelhöffer, Hellmuth A1 - Fedelich, Bernard A1 - Brückner, Udo A1 - Portella, Pedro Dolabella T1 - New technique for characterization of microstructural degradation under creep: Application to the nickel-base superalloy CMSX-4 N2 - A new experimental technique (repeated load annealing of flat wedge shaped specimens) was proposed for characterization of microstructural degradation under creep conditions. This technique was applied to investigate the microstructural degradation of the nickel-base superalloy CMSX-4 in a wide range of temperatures and stress levels. The results obtained allowed to describe analytically the kinetics of rafting, which is important to predict the reduction of fatigue lifetime and yield stress. KW - Microstructural degradation KW - Nickel-base superalloys KW - Rafting PY - 2009 DO - https://doi.org/10.1016/j.msea.2008.04.135 SN - 0921-5093 SN - 1873-4936 VL - 510-511 SP - 262 EP - 265 PB - Elsevier CY - Amsterdam AN - OPUS4-19354 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brückner, Udo A1 - Epishin, Alexander A1 - Link, T. A1 - Fedelich, Bernard A1 - Portella, Pedro Dolabella ED - Denis, S. T1 - Dendritic stresses in Nickel-base superalloys T2 - 7th International Conference on Residual Stresses CY - Xi'an, China DA - 2004-06-14 KW - Single crystal KW - Superalloy KW - Dendritic structure KW - Residual stresses KW - X-ray diffraction KW - Nickelbasis-Superlegierung KW - Dendritisches Gefüge KW - Röntgenbeugung PY - 2005 SN - 0-87849-969-5 SN - 0255-5476 N1 - Serientitel: Materials science forum – Series title: Materials science forum IS - 490/491 SP - 497 EP - 502 PB - Trans Tech Publ. CY - Uetikon-Zürich AN - OPUS4-7148 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Epishin, Alexander A1 - Link, T. A1 - Brückner, Udo A1 - Fedelich, Bernard A1 - Portella, Pedro Dolabella ED - Green, K. T1 - Effects of segregation in nickel-base superalloys: dendritic stresses T2 - Superalloys 2004 / 10th International Symposium on Superalloys 2004 CY - Seven Springs, PA, USA DA - 2004-09-19 KW - Nickel-base superalloys KW - Dendritic structure KW - Segregation KW - Residual stresses PY - 2004 SN - 0-87339-576-X SP - 537 EP - 543 PB - TMS CY - Warrendale AN - OPUS4-7150 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Epishin, Alexander A1 - Link, T. A1 - Klingelhöffer, Hellmuth A1 - Fedelich, Bernard A1 - Portella, Pedro Dolabella ED - S.R. Holdsworth, ED - I.A. Shibli, T1 - Creep damage mechanisms of single-crystal Nickel base superalloys T2 - 2nd ECCC Creep Conference CY - Zurich, Switzerland DA - 2009-04-21 KW - Creep damage KW - Nickel-base superalloys PY - 2009 SN - 978-1-60595-005-1 SP - 692 EP - 701 PB - DEStech Publications, Inc. AN - OPUS4-19448 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fedelich, Bernard A1 - Epishin, A. A1 - Link, T. A1 - Klingelhöffer, Hellmuth A1 - Künecke, Georgia A1 - Portella, Pedro Dolabella ED - Huron, E.S. ED - Reed, R.C. ED - Hardy, M.C. ED - Mills, M.J. ED - Montero, R.E. ED - Portella, Pedro Dolabella ED - Telesman, J. T1 - Rafting during high temperature deformation in a single crystal superalloy: experiments and modeling T2 - Superalloys 2012 - 12th International symposium on superalloys CY - Seven, Springs, PA, USA DA - 2012-09-09 KW - Creep KW - Single crystal KW - Rafting KW - Modeling KW - CMSX-4 KW - Low-cycle-fatigue PY - 2012 SP - 491 EP - 500 PB - Wiley AN - OPUS4-26842 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Portella, Pedro Dolabella A1 - Bettge, Dirk A1 - Klinger, Christian A1 - Baer, Wolfram T1 - Über das Versagen von Strommasten im Münsterland (Nov. 2005) - der Beitrag der Metallographie und der Fraktographie T2 - 43. Metallographie-Tagung CY - Aachen, Deutschland DA - 2009-09-16 PY - 2009 SN - 978-3-88355-376-4 VL - 41 SP - 21 EP - 30 PB - Werkstoff-Informationsges. CY - Frankfurt/M. AN - OPUS4-20061 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Portella, Pedro Dolabella T1 - Über das Versagen von Strommasten im Münsterland (Nov. 2005) - der Beitrag der Metallographie und der Fraktographie T2 - 43. Metallographie-Tagung CY - Aachen, Germany DA - 2009-09-16 PY - 2009 AN - OPUS4-20348 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -