Microstructure and Fatigue Damage Evolution in Additive-Manufactured Metals Using Enhanced Measurement Techniques and Modeling Approaches
Abstract
Process-induced microstructures have a high impact on the fatigue strength of engineering materials. Advanced materials testing builds the base for the design and manufacturing of reliable, high-performance products for various technical applications. Combining modern analytical and intermittent testing strategies with applied enhanced measurement techniques, i.e., physical instrumentation of testing specimens during loading, allows the characterization of process-structure-property relationships in various fatigue damage stages. Further, in situ mechanical testing in analytical devices like micro-computed tomography (µ-CT) enables the immediate correlation of material’s physical reactions with the applied loading conditions. The focus of the presented studies. Using the proposed technique, the characterization of fatigue damage evolution and progression before failure depending on environmental as well as material specific microstructural characteristics is carried out. Investigations on additively manufactured Al alloys revealed the interaction between porosity and microstructure under very high-cycle fatigue (VHCF) loading conditions. Measurement-based fatigue damage tracking during testing of SLM aluminum alloys revealed the interaction between porosity and microstructure under loading in the very high-cycle fatigue (VHCF) regime. The grain boundary strengthening of the microstructure increased VHCF strength by 33%.
Publication Title
Minerals, Metals and Materials Series
Recommended Citation
Awd, M., Walther, F., Siddique, S., & Fatemi, A. (2021). Microstructure and Fatigue Damage Evolution in Additive-Manufactured Metals Using Enhanced Measurement Techniques and Modeling Approaches. Minerals, Metals and Materials Series, 5, 753-762. https://doi.org/10.1007/978-3-030-65261-6_68
