TY - JOUR A1 - Graf, Karin A1 - Tetzlaff, Ulrich A1 - Biscaia de Souza, Gelson A1 - Scheid, Adriano T1 - Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate JF - Materials Research: Revista Ibero-Americana de Materiais N2 - The Laves phase reinforced CoCrMoSi alloy system has emerged as a candidate material to protect the surface of components to withstand harsh environments under wear and/or corrosion. However, previous reports have raised some concerns and restricted a wider selection of iron-based substrates to be coated, especially limiting the carbon content. This work aims to outline the Laves - Carbides phases in the microstructure and its effect on the properties of T400 alloy deposited on GGG40 ductile iron. Dilution of 26 % ensured Laves formation either as primary or secondary, due to high-silicon substrate selected. Departing from 41 % dilution, the alloy changed to a completely carbide strengthened system. Therefore, for the lowest dilution the coatings hardness is dictated by Laves phase whereas, for higher ones, carbides are the most influent phases. UR - https://doi.org/10.1590/1980-5373-MR-2018-0502 KW - CoCrMoSi Alloy KW - Microstructure KW - Coatings KW - High-Carbon Substrate Y1 - 2018 UR - https://doi.org/10.1590/1980-5373-MR-2018-0502 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-9593 SN - 1980-5373 SN - 1516-1439 VL - 22 IS - 1 PB - Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) CY - São Carlos ER - TY - CHAP A1 - Keim, Simon A1 - Tetzlaff, Ulrich A1 - Elger, Gordon T1 - The influence of different-sized Ni micro- and nanopowders on the processing and microstructural properties of Sn-Ag-Cu-solder with low Ag content T2 - Proceedings : IEEE 70th Electronic Components and Technology Conference : ECTC 2020 UR - https://doi.org/10.1109/ECTC32862.2020.00312 KW - Composites KW - Soldering KW - Porosity KW - Microstructure KW - Intermetallics KW - Phase interfaces Y1 - 2020 UR - https://doi.org/10.1109/ECTC32862.2020.00312 SN - 978-1-7281-6180-8 SN - 2377-5726 SP - 2005 EP - 2012 PB - IEEE CY - Piscataway ER - TY - JOUR A1 - Bhogaraju, Sri Krishna A1 - Conti, Fosca A1 - Kotadia, Hiren R. A1 - Keim, Simon A1 - Tetzlaff, Ulrich A1 - Elger, Gordon T1 - Novel approach to copper sintering using surface enhanced brass micro flakes for microelectronics packaging JF - Journal of Alloys and Compounds UR - https://doi.org/10.1016/j.jallcom.2020.156043 KW - Metals and alloys KW - Microstructure KW - Surfaces and interfaces KW - Sintering Y1 - 2020 UR - https://doi.org/10.1016/j.jallcom.2020.156043 SN - 1873-4669 VL - 2020 IS - 844 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Handwerker, Michael A1 - Kessler, Jörg A1 - Marzbani, Hormoz A1 - Tetzlaff, Ulrich T1 - Pressure and heat treatment of continuous fibre reinforced thermoplastics produced by fused filament fabrication JF - Progress in Additive Manufacturing N2 - Fused filament fabrication allows for the additive manufacturing of complex geometries without requiring moulds. However, due to large air voids and poor layer adhesion, the mechanical properties of parts manufactured using fused filament fabrication lag behind those of parts manufactured using conventional techniques. A previous study found that the tensile strength and Young’s modulus of such parts could be increased by a heat-treatment process. However, large air voids were still present after annealing. This study, therefore, investigates the influence of a post-pressure-treatment process on the mechanical performance and the air void ratio of continuous glass fibre-reinforced polyamide 6 in the directions perpendicular to the fibres. Without the treatment, Young’s modulus on the plane parallel to the printing bed is eight times higher than Young’s modulus perpendicular to it. Annealing at 1 MPa homogenises the material and leads to a significant increase of both the tensile strength (55 MPa) and Young’s modulus (5 GPa). Increasing the pressure to 3 MPa only slightly increases the mechanical performance, whereas a further increase to 6 MPa causes no significant changes. UR - https://doi.org/10.1007/s40964-022-00315-5 KW - Pressure treatment KW - Fused filament fabrication KW - Continuous glass fibre KW - Polyamide 6 Y1 - 2022 UR - https://doi.org/10.1007/s40964-022-00315-5 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-31239 SN - 2363-9520 SN - 2363-9512 VL - 8 IS - 2 SP - 99 EP - 116 PB - Springer CY - Cham ER - TY - JOUR A1 - Kiehl, Maximilian A1 - Scheid, Adriano A1 - Graf, Karin A1 - Ernst, Benedikt A1 - Tetzlaff, Ulrich T1 - Coaxial Laser Cladding of Cobalt-Base Alloy Stellite™ 6 on Grey Cast Iron Analysis of the Microstructural and Mechanical Properties Depending on the Laser Power JF - Journal of Materials Engineering and Performance N2 - A high-power diode laser was used to generate single- and multi-bead coatings of Stellite™ 6 by coaxial laser cladding over flat grey cast iron (EN-GJLP-200) as a preliminary study to develop a wear and corrosion resistant coating for brake disks on a cost-effective substrate. In this article, we have focused on a detailed quantitative analysis of the effect of different laser powers (1.5, 2.0, 2.5, 3.0, 3.5, and 4.0 kW) on the bead geometry, dilution, microstructure, and hardness. Coatings dilution or composition depends directly on the laser power as well as bead geometry. The typical microstructure of the coatings comprises a solid solution of α (hcp)- and β (fcc)-Co with a dendritic structure as a metal matrix and an interdendritic lamellar eutectic, which contains predominantly β-Co, chromium carbides Cr7C3 and Cr23C6 as well as blocky tungsten carbide W2C. Coating hardness depends on the chemical composition and microstructure that is modified by the deposition parameters. Low laser power results in high carbide fraction and most refined microstructures, accounting for harder coatings. UR - https://doi.org/10.1007/s11665-022-07358-3 KW - bead geometry KW - grey cast iron KW - hardness KW - laser power KW - microstructure KW - Stellite 6™ Y1 - 2022 UR - https://doi.org/10.1007/s11665-022-07358-3 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-31249 SN - 1544-1024 SN - 1059-9495 VL - 32 IS - 8 SP - 3821 EP - 3838 PB - Springer CY - New York ER - TY - JOUR A1 - Benedet Dutra, Gabriel A1 - Tetzlaff, Ulrich A1 - Vieira da Cunha, Tiago A1 - dos Santos, Carlos Eduardo A1 - Lemos, Georges T1 - Microstructural Characterization of an ERNiCrMo-3 and Grey Cast Iron Interface Obtained via TIG Welding JF - Metallurgical and Materials Transactions B UR - https://doi.org/10.1007/s11663-022-02549-8 Y1 - 2022 UR - https://doi.org/10.1007/s11663-022-02549-8 SN - 1073-5615 VL - 53 IS - 4 SP - 2534 EP - 2546 PB - Springer Nature CY - Cham ER - TY - JOUR A1 - Handwerker, Michael A1 - Kessler, Jörg A1 - Marzbani, Hormoz A1 - Tetzlaff, Ulrich T1 - Annealing of chopped and continuous fibre reinforced polyamide 6 produced by fused filament fabrication JF - Composites Part B: Engineering UR - https://doi.org/10.1016/j.compositesb.2021.109119 KW - Annealing KW - Fused filament fabrication KW - Continuous glass fiber KW - Polyamide 6 Y1 - 2021 UR - https://doi.org/10.1016/j.compositesb.2021.109119 SN - 1879-1069 VL - 2021 IS - 223 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Gulden, Florian A1 - Reinhold, B. A1 - Gramstat, Sebastian A1 - Tetzlaff, Ulrich A1 - Höppel, Heinz Werner ED - Pfeffer, Peter E. T1 - Investigation of the run-in and corrosion behavior of a PEO-coated aluminum brake disc T2 - 10th International Munich Chassis Symposium 2019 : chassis.tech plus UR - https://doi.org/10.1007/978-3-658-26435-2_43 Y1 - 2019 UR - https://doi.org/10.1007/978-3-658-26435-2_43 SN - 978-3-658-26435-2 SN - 978-3-658-26434-5 SP - 611 EP - 631 PB - Springer Vieweg CY - Wiesbaden ER - TY - JOUR A1 - Thambi, Joel Luther A1 - Tetzlaff, Ulrich A1 - Schiessl, Andreas A1 - Lang, Klaus-Dieter A1 - Waltz, Manuela T1 - Evaluation of the relationship between stress and lifetime of Pb-free solder joints subjected to vibration load using a generalized local stress approach JF - Microelectronics Reliability UR - https://doi.org/10.1016/j.microrel.2019.113560 KW - SnAgCu KW - High cycle fatigue (HCF) KW - Local stress KW - FKM guideline KW - Stress gradient KW - Roughness KW - Solder alloys KW - Experimental analysis KW - FEA KW - Surface mount technology (SMT) KW - Vibration KW - Harmonic frequency KW - Bulk solder KW - Fatigue KW - Durability KW - Solder joint failure KW - Component testing KW - Material characterisation KW - Chip capacitor KW - Transformer Y1 - 2020 UR - https://doi.org/10.1016/j.microrel.2019.113560 SN - 0026-2714 IS - 106 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Thambi, Joel Luther A1 - Schiessl, Andreas A1 - Waltz, Manuela A1 - Lang, Klaus-Dieter A1 - Tetzlaff, Ulrich T1 - Modified Constitutive Creep Laws With Micromechanical Modeling of Pb-Free Solder Alloys JF - Journal of Electronic Packaging UR - https://doi.org/10.1115/1.4035850 KW - failure analysis KW - harsh environment KW - microsystems KW - physics of failure KW - reliability KW - SMT KW - solder KW - thermal analysis Y1 - 2017 UR - https://doi.org/10.1115/1.4035850 SN - 1528-9044 SN - 1043-7398 VL - 139 IS - 3 PB - The American Society of Mechanical Engineers CY - New York ER - TY - JOUR A1 - Thambi, Joel Luther A1 - Tetzlaff, Ulrich A1 - Schiessl, Andreas A1 - Lang, Klaus-Dieter A1 - Waltz, Manuela T1 - High cycle fatigue behaviour and generalized fatigue model development of lead-free solder alloy based on local stress approach JF - Microelectronics Reliability UR - https://doi.org/10.1016/j.microrel.2016.10.004 KW - Sn3.8Ag0.7Cu (SAC) KW - high cycle fatigue KW - local stress KW - FKM guideline KW - cyclic softening KW - stress concentration KW - roughness KW - mean stress KW - solder joint KW - surface mount technology (SMT) KW - stress KW - experimental analysis KW - vibration Y1 - 2016 UR - https://doi.org/10.1016/j.microrel.2016.10.004 SN - 0026-2714 IS - 66 SP - 98 EP - 105 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Kubaschinski, Paul A1 - Baruth, Albin A1 - Tetzlaff, Ulrich A1 - Altenbach, Holm A1 - Waltz, Manuela T1 - Untersuchungen zur Ermittlung der zyklischen Kennwerte von dünnem Elektroblech im Rahmen der rechnerischen Lebensdauerabschätzung T2 - Betriebsfestigkeit - Wissensmanagement und Methodenentwicklung entlang der Wertschöpfungskette UR - https://doi.org/10.48447/BF-2022-014 KW - cyclic material properties KW - notch strain approach KW - electrical steel KW - fatigue strength Y1 - 2022 UR - https://doi.org/10.48447/BF-2022-014 SP - 163 EP - 178 ER - TY - JOUR A1 - de Souza Pinto Pereira, Adriano A1 - Gutjahr, Jhonattan A1 - Pereira, Milton A1 - Tetzlaff, Ulrich A1 - Fredel, Márcio Celso T1 - Processability of thin-powdered Inconel X750 and TiC metal matrix composite by laser-directed energy deposition JF - Journal of Laser Applications UR - https://doi.org/10.2351/7.0001134 KW - metal matrix composites KW - directed energy deposition KW - laser materials processing KW - Ni-base superalloys KW - particle reinforcement KW - microstructural characterization Y1 - 2023 UR - https://doi.org/10.2351/7.0001134 SN - 1042-346X SN - 1938-1387 N1 - Paper published as part of the special topic on Proceedings of the International Congress of Applications of Lasers & Electro-Optics 2023 VL - 35 IS - 4 PB - LIA CY - Orlando ER - TY - JOUR A1 - Volpato, Guilherme A1 - Pereira, A. S. P. A1 - Lemos, Georges A1 - Schmitt, Matthias A1 - Glatzel, Uwe A1 - Pyczak, Florian A1 - Tetzlaff, Ulrich A1 - Fredel, Márcio Celso T1 - Out-of-Equilibrium Formation of Ni3Ti η-Phase in Inconel X-750 Produced via Laser Powder Bed Fusion and Spark Plasma Sintering JF - Metallurgical and Materials Transactions A: Physical metallurgy and materials science UR - https://doi.org/10.1007/s11661-022-06946-1 Y1 - 2023 UR - https://doi.org/10.1007/s11661-022-06946-1 SN - 1073-5623 VL - 54 IS - 5 SP - 1924 EP - 1936 PB - Springer CY - Boston ER - TY - JOUR A1 - Corrêa da Silva, Cauê A1 - Maziero Volpato, Guilherme A1 - Fredel, Márcio Celso A1 - Tetzlaff, Ulrich T1 - Low-pressure processing and microstructural evaluation of unidirectional carbon fiber-reinforced aluminum-nickel matrix composites JF - Journal of Materials Processing Technology UR - https://doi.org/10.1016/j.jmatprotec.2019.01.032 KW - Aluminum matrix composites KW - Carbon fibers KW - Composite processing KW - Intermetallics KW - Casting Y1 - 2019 UR - https://doi.org/10.1016/j.jmatprotec.2019.01.032 SN - 0924-0136 VL - 2019 IS - 269 SP - 10 EP - 15 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Gulden, Florian A1 - Gramstat, Sebastian A1 - Stich, Anton A1 - Hoppel, Heinz Werner A1 - Tetzlaff, Ulrich T1 - Properties and Limitation of an Oxide Coated Aluminum Brake Rotor JF - SAE technical papers UR - https://doi.org/10.4271/2018-01-1877 Y1 - 2018 UR - https://doi.org/10.4271/2018-01-1877 SN - 0148-7191 PB - SAE CY - Warrendale ER - TY - JOUR A1 - Gottwalt, Albin A1 - Kubaschinski, Paul A1 - Waltz, Manuela A1 - Tetzlaff, Ulrich T1 - Influence of the cutting method on the fatigue life and crack initiation of non-oriented electrical steel sheets JF - International Journal of Fatigue N2 - The fatigue behavior of thin electrical steel sheets under cyclic loading is investigated in dependence on the edge surface. Therefore, four different edge conditions are compared, whereas the edge is either laser cut, shear cut, wire cut, or polished. Strain- and stress-controlled fatigue tests are performed to determine S-N curves in the low cycle regime as well as in the high cycle regime. Microstructural data is collected by non-contacting (optical) Profilometry, Nanoindentation, X-Ray Diffraction, and Electron Backscatter Diffraction to understand the differences in fatigue life by considering surface roughness, residual stresses, hardness, and microstructure. Shear cut specimens achieve the lowest fatigue life, while the other edge conditions reach relatively similar values in the LCF regime. Crack initiation is mainly intergranular in the case of defect-free edges. This tendency has a considerable influence on the observed fatigue behavior. UR - https://doi.org/10.1016/j.ijfatigue.2023.108073 Y1 - 2023 UR - https://doi.org/10.1016/j.ijfatigue.2023.108073 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-46260 SN - 1879-3452 SN - 0142-1123 VL - 2024 IS - 180 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Gottwalt, Albin A1 - Kubaschinski, Paul A1 - Waltz, Manuela A1 - Völkl, Rainer A1 - Glatzel, Uwe A1 - Tetzlaff, Ulrich T1 - Cyclic deformation behavior of non-oriented electrical steel sheets JF - Materials Science and Engineering: A UR - https://doi.org/10.1016/j.msea.2023.145684 Y1 - 2023 UR - https://doi.org/10.1016/j.msea.2023.145684 SN - 0921-5093 VL - 2023 IS - 886 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Schmitt, Matthias A1 - Gottwalt, Albin A1 - Winkler, Jakob A1 - Tobie, Thomas A1 - Schlick, Georg A1 - Stahl, Karsten A1 - Tetzlaff, Ulrich A1 - Schlip, Johannes A1 - Reinhart, Gunther T1 - Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion JF - Metals N2 - The carbon content of steel affects many of its essential properties, e.g., hardness and mechanical strength. In the powder bed fusion process of metals using a laser beam (PBF-LB/M), usually, pre-alloyed metal powder is solidified layer-by-layer using a laser beam to create parts. A reduction of the carbon content in steels is observed during this process. This study examines adding carbon particles to the metal powder and in situ alloying in the PBF-LB/M process as a countermeasure. Suitable carbon particles are selected and their effect on the particle size distribution and homogeneity of the mixtures is analysed. The workability in PBF-LB is then shown. This is followed by an evaluation of the resulting mechanical properties (hardness and mechanical strength) and microstructure in the as-built state and the state after heat treatment. Furthermore, potential use cases like multi-material or functionally graded parts are discussed. UR - https://doi.org/10.3390/met11060896 KW - additive manufacturing KW - PBF-LB/M KW - in situ alloying KW - case-hardening steel KW - 16MnCr5 KW - gears KW - multi-material Y1 - 2021 UR - https://doi.org/10.3390/met11060896 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-10976 SN - 2075-4701 N1 - This article belongs to the Special Issue Advances in Additive Manufacturing of Metals VL - 11 IS - 6 PB - MDPI CY - Basel ER - TY - JOUR A1 - Kubaschinski, Paul A1 - Gottwalt, Albin A1 - Tetzlaff, Ulrich A1 - Altenbach, Holm A1 - Waltz, Manuela T1 - Calibration of a combined isotropic-kinematic hardening material model for the simulation of thin electrical steel sheets subjected to cyclic loading T1 - Kalibrierung eines Materialmodells für die Simulation von zyklisch beanspruchten dünnen Elektroblechen unter Berücksichtigung kombinierter isotroper-kinematischer Verfestigung JF - Materials Science & Engineering Technology JF - Materialwissenschaft und Werkstofftechnik N2 - The combined isotropic-kinematic hardening model enables the description of the cyclic transient elastic-plastic material behaviour of steel. However, the determination of the material model parameters and understanding of their influence on the material response can be a challenging task. This study deals with the individual steps of the material model calibration for the simulation of thin electrical steel sheets under cyclic loading. Specific recommendations are made for the determination of kinematic and isotropic hardening material parameters. In particular, the isotropic hardening evolution is described by Voce's exponential law and a simple multilinear approach. Based on the multilinear approach, which allows for different slopes in the evolution of the yield surface size, an alternative calibration of the isotropic hardening component is proposed. As a result, the presence of the yield plateau in the first half cycle can be accurately captured, while convergence issues in the material model definition for numerical simulations can be avoided. The comparison of simulated load cycles with experimental cyclic tests shows a good agreement, which indicates the suitability of the proposed material model calibration for electrical steel. N2 - Die Berücksichtigung kombinierter isotroper-kinematischer Verfestigung ermöglicht die Beschreibung und Modellierung des transienten elastisch-plastischen Werkstoffverhaltens von Stahl. Die Ermittlung der zugrunde liegenden Materialparameter und das Verständnis für deren Einfluss auf die Materialantwort stellt jedoch häufig eine anspruchsvolle Aufgabe dar. In der vorliegenden Arbeit wird auf die einzelnen Schritte bei der Kalibrierung des Materialmodells im Rahmen einer Simulation von zyklisch beanspruchten dünnen Elektroblechen eingegangen. Dabei werden konkrete Empfehlungen für die Ermittlung der kinematischen und isotropen Verfestigungsparameter gegeben. Die Evolutionsgleichung der isotropen Verfestigung wird sowohl durch einen Exponentialansatz nach Voce als auch durch einen einfachen multilinearen Ansatz beschrieben. Basierend auf dem multilinearen Ansatz, der unterschiedliche Steigungen in der Evolution der Fließfläche ermöglicht, wird eine alternative Kalibrierung der isotropen Komponente vorgeschlagen. Dadurch kann das auftretende Fließplateau im ersten Halbzyklus präzise erfasst werden, während Konvergenzprobleme des Materialmodells vermieden werden. Der Vergleich von simulierten Belastungszyklen mit experimentellen Daten zeigt eine gute Übereinstimmung, was für die Eignung des vorgeschlagenen Kalibrierungsprozesses für Elektroblech spricht. UR - https://doi.org/10.1002/mawe.202100341 KW - cyclic plasticity KW - material model KW - combined hardening KW - finite-element simulation KW - electrical steel KW - zyklische Plastizität KW - Materialmodell KW - kombinierte Verfestigung KW - Finite-Elemente-Simulation KW - Elektroblech Y1 - 2022 UR - https://doi.org/10.1002/mawe.202100341 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-22478 SN - 1521-4052 VL - 53 IS - 4 SP - 422 EP - 439 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Gottwalt, Albin A1 - Kubaschinski, Paul A1 - Waltz, Manuela A1 - Glatzel, Uwe A1 - Tetzlaff, Ulrich T1 - An experimental setup for fatigue testing of thin electrical steel sheets JF - International Journal of Fatigue N2 - In this study, the fatigue behavior of thin electrical steel sheets under cyclic loading is investigated. Results from strain-controlled and stress-controlled fatigue tests with different specimen geometries and different test setups are presented and compared with conventional testing methods. The results imply that conventional testing methods should be adjusted for testing thin electrical steel sheets because the fatigue life depends significantly on the test setup as well as the specimen geometry. Therefore, this study proposes an improved specimen geometry and test setup for stress- and strain-controlled fatigue tests of thin electrical steel sheets depending on the desired testing parameters. UR - https://doi.org/10.1016/j.ijfatigue.2022.106987 KW - High cycle fatigue KW - Low cycle fatigue KW - Non-oriented electrical steel KW - Specimen geometry KW - Experimental methods Y1 - 2022 UR - https://doi.org/10.1016/j.ijfatigue.2022.106987 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-28822 SN - 0142-1123 VL - 2022 IS - 162 PB - Elsevier CY - Oxford ER - TY - CHAP A1 - Gulden, Florian A1 - Stich, Anton A1 - Gramstat, Sebastian A1 - Höppel, Heinz Werner A1 - Tetzlaff, Ulrich T1 - Investigations of the third body using pin-on-disc and brake dynamometer on all-MMC brake rotors T2 - EuroBrake 2018 Conference Proceedings Y1 - 2018 SN - 978-1-5108-7963-8 SP - 401 EP - 407 PB - FISITA CY - Bishops Stortford ER - TY - CHAP A1 - Volpato, Guilherme A1 - Fredel, Márcio Celso A1 - Tetzlaff, Ulrich T1 - Dry Sliding Wear and Fe Contamination of Investment-cast SiC Foam Reinforced Aluminum Matrix Composites T2 - EuroBrake 2019 Conference Proceedings Y1 - 2019 SN - 978-0-9572076-3-9 PB - FISITA CY - Bishops Stortford ER - TY - JOUR A1 - Kiehl, Maximilian A1 - Scheid, Adriano A1 - Graf, Karin A1 - Ernst, Benedikt A1 - Tetzlaff, Ulrich T1 - Coaxial laser cladding of cobalt-base alloy Stellite™ 6 on gray cast iron/investigations on friction, wear versus commercial brake pad, and corrosion characteristics JF - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering UR - https://doi.org/10.1177/09544070221145512 Y1 - 2023 UR - https://doi.org/10.1177/09544070221145512 SN - 2041-2991 SN - 0954-4070 VL - 237 IS - 14 SP - 3285 EP - 3303 PB - Sage CY - London ER - TY - JOUR A1 - Lemos, Georges A1 - Fredel, Márcio Celso A1 - Pyczak, Florian A1 - Tetzlaff, Ulrich T1 - Creep resistance improvement of a polycrystalline Ni-based superalloy via TiC particles reinforcement JF - Materials Science and Engineering: A UR - https://doi.org/10.1016/j.msea.2022.143821 Y1 - 2022 UR - https://doi.org/10.1016/j.msea.2022.143821 SN - 1873-4936 SN - 0921-5093 VL - 2022 IS - 854 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Volpato, Guilherme A1 - Tetzlaff, Ulrich A1 - Fredel, Márcio Celso T1 - A comprehensive literature review on laser powder bed fusion of Inconel superalloys JF - Additive Manufacturing UR - https://doi.org/10.1016/j.addma.2022.102871 KW - Inconel 718 KW - Inconel 625 KW - Laser powder bed fusion KW - Selective laser melting KW - Additive manufacturing Y1 - 2022 UR - https://doi.org/10.1016/j.addma.2022.102871 SN - 2214-7810 SN - 2214-8604 VL - 2022 IS - 55 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Ernst, Benedikt A1 - Keim, Simon A1 - Tetzlaff, Ulrich T1 - On the anisotropic indentation modulus and anisotropic creep behavior of β-Sn characterized by nanoindentation methods JF - Materials Science and Engineering: A UR - https://doi.org/10.1016/j.msea.2022.143392 Y1 - 2022 UR - https://doi.org/10.1016/j.msea.2022.143392 SN - 1873-4936 SN - 0921-5093 VL - 2022 IS - 848 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Mokhtari, Omid A1 - Conti, Fosca A1 - Bhogaraju, Sri Krishna A1 - Meier, Markus A1 - Schweigart, Helmut A1 - Tetzlaff, Ulrich A1 - Elger, Gordon T1 - Characterization of tin-oxides and tin-formate crystals obtained from SnAgCu solder alloy under formic acid vapor JF - New Journal of Chemistry UR - https://doi.org/10.1039/C9NJ02135C Y1 - 2019 UR - https://doi.org/10.1039/C9NJ02135C SN - 1369-9261 VL - 43 IS - 26 SP - 10227 EP - 10231 PB - RSC CY - London ER - TY - JOUR A1 - Kubaschinski, Paul A1 - Gottwalt, Albin A1 - Tetzlaff, Ulrich A1 - Altenbach, Holm A1 - Waltz, Manuela T1 - Modelling and simulation of the hardness profile and its effect on the stress‐strain behaviour of punched electrical steel sheets T1 - Modellierung und Simulation des Härteprofils und dessen Einfluss auf das Spannungs-Dehnungs-Verhalten gestanzter Elektrobleche JF - Materials Science & Engineering Technology N2 - The shear cutting of electrical steel sheets has a significant influence on the magnetic and mechanical material properties. Due to plastic deformation and strain hardening in the area of the punched edge, the electrical steel sheets exhibit a characteristic hardness profile. This study deals with the modelling of the resulting hardness profile by means of finite-element simulations. Elastic-plastic material properties are obtained from spherical nanoindentation testing as a function of the local hardness. In particular, representative stress-strain values are determined by applying Tabor's concept of indentation stress-strain curves. The choice of the appropriate stress- and strain-constraint factors is discussed with respect to the nanoindentation test setup used. Following this, the representative stress-strain values are analytically described to determine true stress-strain curves for the local assignment of different material models depending on the hardness. The implementation of the modelling approach in a finite-element simulation is presented for a punched electrical steel sheet specimen under monotonic loading. The simulation results are basically in good agreement with experimental data and confirm the expected influence on the mechanical material behaviour due to the shear cutting process. N2 - Scherschneiden hat einen wesentlichen Einfluss auf die magnetischen und mechanischen Werkstoffeigenschaften von Elektroblech. Aufgrund plastischer Verformung und Kaltverfestigung im Bereich der Stanzkante weisen Elektroblechschnitte ein charakteristisches Härteprofil auf. Dieses wird in der vorliegenden Arbeit im Rahmen von Finite-Elemente-Simulationen modelliert. Elastisch-plastische Materialeigenschaften werden durch Nanoindentierung mit kugelförmigem Prüfkörper als Funktion der lokalen Härte ermittelt. Dabei handelt es sich um repräsentative Spannungs-Dehnungs- Werte, die sich mithilfe Tabors Konzept aus dem Eindruckversuch bestimmen lassen. Die Wahl geeigneter Spannungs- und Dehnungsproportionalitätsfaktoren wird unter Berücksichtigung des verwendeten Prüfaufbaus diskutiert. Im Anschluss daran erfolgt die analytische Beschreibung der repräsentativen Spannungs-Dehnungs-Werte zur Bestimmung wahrer Spannungs-Dehnungs-Kurven, die basierend auf dem zugehörigen Härtewert zur Zuweisung lokal unterschiedlicher Materialmodelle herangezogen werden. Die Umsetzung des Modellierungsansatzes geschieht für eine gestanzte Elektroblechprobe unter monotoner Beanspruchung. Der Vergleich der Simulationsergebnisse mit experimentellen Daten zeigt grundsätzlich eine gute Übereinstimmung und bestätigt den erwarteten Einfluss des Scherschneidens auf das mechanische Werkstoffverhalten. UR - https://doi.org/10.1002/mawe.202200283 KW - electrical steel KW - hardness distribution KW - material modelling KW - nanoindentation KW - punched edge KW - Elektroblech KW - Härteverteilung KW - Materialmodellierung KW - Nanoindentierung KW - Stanzkante Y1 - 2023 UR - https://doi.org/10.1002/mawe.202200283 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-38333 SN - 0933-5137 VL - 54 IS - 4 SP - 512 EP - 526 PB - Wiley CY - Weinheim ER - TY - JOUR A1 - Tetzlaff, Ulrich A1 - Gerber, Alexander A1 - Amelang, Rudolf A1 - Lemos, Georges T1 - Investigation of the Creep Resistance of a Spray-Compacted Si-Particle Reinforced Al-Based MMC (Dispal® S270) JF - Key Engineering Materials UR - https://doi.org/10.4028/www.scientific.net/KEM.809.87 KW - Creep resistance KW - MMC KW - particle reinforcement KW - multi-phase KW - microstructure analysis Y1 - 2019 UR - https://doi.org/10.4028/www.scientific.net/KEM.809.87 SN - 1662-9795 VL - 2019 IS - 809 SP - 87 EP - 93 PB - Trans Tech Publications CY - Baech ER - TY - JOUR A1 - Lemos, Georges A1 - Fredel, Márcio Celso A1 - Pyczak, Florian A1 - Tetzlaff, Ulrich T1 - Influence of distinct manufacturing processes on the microstructure of Ni-based metal matrix composites submitted to long thermal exposure JF - Key Engineering Materials UR - https://doi.org/10.4028/www.scientific.net/KEM.809.79 KW - MMC KW - particle reinforcement KW - TiC KW - isothermal aging KW - superalloy KW - Inconel X-750 Y1 - 2019 UR - https://doi.org/10.4028/www.scientific.net/KEM.809.79 SN - 1662-9795 VL - 2019 IS - 809 SP - 79 EP - 86 PB - Trans Tech Publications CY - Baech ER -