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 SN - 1873-4936 VL - 2023 IS - 886 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Vieweger, Daniel A1 - Diel, Sergej A1 - Schweiger, Hans-Georg A1 - Tetzlaff, Ulrich T1 - Mechanical Properties of Raw Filaments and Printed Specimens: Effects of Fiber Reinforcements and Process Parameters JF - Polymers N2 - Fused Deposition Modeling (FDM) is a well-established manufacturing method for producing both prototype and functional components. This study investigates the mechanical properties of FDM components by material and process-related influencing variables. Tensile tests were conducted on seven different materials in their raw filament form, two of which were fiber-reinforced, to analyze their material-related influence. To cover a wide range from standard to advanced materials relevant for load-carrying components as well as their respective variations, polylactic acid (PLA), 30% wood-fiber-reinforced PLA, acrylonitrile butadiene styrene (ABS), polycarbonate (PC), a blend of ABS and PC, Nylon, and 30% glass-fiber-reinforced Nylon were selected. The process-related influencing variables were studied using the following process parameters: layer thickness, nozzle diameter, build orientation, nozzle temperature, infill density and pattern, and raster angle. The first test series revealed that the addition of wood fibers significantly worsened the mechanical behavior of PLA due to the lack of fiber bonding to the matrix and significant pore formation. The polymer blend of ABS and PC only showed improvements in stiffness. Significant strength and stiffness improvements were found by embedding glass fibers in Nylon, despite partially poor fiber–matrix bonding. The materials with the best properties were selected for the process parameter analysis. When examining the impact of layer thickness on part strength, a clear correlation was evident. Smaller layer thicknesses resulted in higher strength, while stiffness did not appear to be affected. Conversely, larger nozzle diameters and lower nozzle temperatures only positively impacted stiffness, with little effect on strength. The part orientation did alter the fracture behavior of the test specimens. Although an on-edge orientation resulted in higher stiffness, it failed at lower stresses. Higher infill densities and infill patterns aligned with the load direction led to the best mechanical results. The raster angle had a significant impact on the behavior of the printed bodies. An alternating raster angle resulted in lower strengths and stiffness compared to a unidirectional raster angle. However, it also caused significant stretching due to the rotation of the beads. UR - https://doi.org/10.3390/polym16111576 Y1 - 2024 UR - https://doi.org/10.3390/polym16111576 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-48595 SN - 2073-4360 VL - 16 IS - 11 PB - MDPI CY - Basel ER - TY - JOUR A1 - Gottwalt, Albin A1 - Kubaschinski, Paul A1 - Waltz, Manuela A1 - Tetzlaff, Ulrich T1 - Influence of Subsequent Heat Treatment on Fatigue Behavior of Shear-Cut Electrical Steel Sheets JF - Alloys N2 - The fatigue behavior of a fully processed, non-oriented electrical steel sheet is investigated in dependence on shear-cutting parameters and a subsequent heat treatment. For this, stress-controlled fatigue tests are performed before and after annealing at 700 °C for a total of six different shear-cutting settings. For all parameters, the fatigue strength of shear-cut sheets is improved by the heat treatment. This is due to reduction in a large part of the strain hardening region as well as the reduction in tensile residual stresses. Both were introduced during shear cutting and act detrimental to the fatigue strength. However, the intensity of this improvement depends on the shear-cutting parameters. This is related to the corresponding edge surfaces characteristically being formed during shear cutting. Specimens cut with a worn cutting tool show a more pronounced increase in fatigue life. In contrast, specimens produced with a sharp-edged cutting tool and high cutting clearance hardly benefit from the heat treatment. This appears to be caused by differences in surface topography, in particular coarse topographical damage in the form of grain breakouts. If these occur during shear cutting, the crack formation is not significantly delayed by additional annealing. UR - https://doi.org/10.3390/alloys3040017 Y1 - 2024 UR - https://doi.org/10.3390/alloys3040017 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-53767 SN - 2674-063X VL - 3 IS - 4 SP - 281 EP - 294 PB - MDPI CY - Basel 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 - CHAP A1 - Mohd, Zubair Akhtar A1 - Kreiner, Christian A1 - Schmid, Maximilian A1 - Zippelius, Andreas A1 - Tetzlaff, Ulrich A1 - Elger, Gordon T1 - Fully Connected Neural Network (FCNN) Based Validation Framework for FEA Post Processing to Improve SAC Solder Reliability Analysis T2 - 2024 IEEE 10th Electronics System-Integration Technology Conference (ESTC), Proceedings UR - https://doi.org/10.1109/ESTC60143.2024.10712023 Y1 - 2024 UR - https://doi.org/10.1109/ESTC60143.2024.10712023 SN - 979-8-3503-9036-0 PB - IEEE CY - Piscataway 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 Paper UR - https://doi.org/10.4271/2018-01-1877 Y1 - 2018 UR - https://doi.org/10.4271/2018-01-1877 SN - 0148-7191 SN - 2688-3627 PB - SAE CY - Warrendale ER - TY - JOUR A1 - Volpato, Guilherme A1 - de Souza Pinto Pereira, Adriano A1 - Neumeier, Steffen A1 - Hotza, Dachamir A1 - Göken, Mathias A1 - Tetzlaff, Ulrich A1 - Fredel, Márcio Celso T1 - Influence of a Standard Heat Treatment on the Microstructure and Properties of Inconel X‐750 Produced by Laser Powder Bed Fusion JF - Advanced Engineering Materials N2 - The production of nickel‐base superalloys through powder bed fusion using a laser beam (PBF‐LB) offers a promising method for reducing the cost of aeronautical components, especially those with complex geometries. However, when these materials are processed using PBF‐LB, the standard heat treatments developed for conventional manufacturing routes do not consistently yield predictable microstructures or mechanical properties. Thus, this study analyzes how PBF‐LB affects the microstructure and mechanical behavior of Inconel alloy X‐750 when compared to a hot‐rolled counterpart after undergoing a standard precipitation‐hardening heat treatment (solution annealing, stabilization, and precipitation). Microstructure is examined using analytical electron microscopy and high‐energy X‐ray diffraction, while mechanical behavior is assessed through microhardness. Significant differences between both manufacturing routes are detected, so that PBF‐LB processing led to an increase in grain size, anisotropy, fraction of low‐angle grain boundaries, mean angle of misorientation, and dislocation density. Moreover, PBF‐LB promoted the formation of γ′‐Ni3(Al,Ti) and η‐Ni3Ti phases during solution annealing and stabilization, respectively. Notably, the formation of γ′ contributes to an anomalous microhardness increase observed between these steps. These findings suggest that PBF‐LB may inhibit recrystallization and facilitate precipitation during heat treatment, thereby affecting the performance of components produced using this technology. UR - https://doi.org/10.1002/adem.202500306 Y1 - 2025 UR - https://doi.org/10.1002/adem.202500306 UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:573-67931 SN - 1527-2648 VL - 27 IS - 24 PB - Wiley CY - Weinheim ER -