|About this Abstract
||MS&T21: Materials Science & Technology
||Deformation-induced Phase Transformations
||Influence of 3D Microstructure on Deformation-induced Martensitic Transformation Studied by In Situ High-energy Diffraction Microscopy and Crystal Plasticity Modeling
||Ye Tian, Xiaohui Tu, He Liu, Ming Guan, Peter Kenesei, Jun-Sang Park, Robert Suter, Todd Hufnagel
|On-Site Speaker (Planned)
Transformation-induced plasticity (TRIP) can increase the work-hardening rate and enhance stability of plastic flow in steels through a deformation-induced martensitic transformation. The relationship between microstructure and the martensitic transformation has been extensively investigated, but additional insights can be obtained from high-energy x-ray diffraction microscopy (HEDM) which provides information about 3D microstructure and strain states. These data enable connections to crystal plasticity models representing the evolution of morphology, crystallography, and anisotropy. In this work, we investigate the deformation-induced martensitic transformation in metastable austenitic Fe-Cr-Ni alloys using in situ HEDM during tensile loading. We track the microstructure evolution and grain-averaged strain tensors, and use these data to inform and validate a crystal plasticity model that accounts for the activation of dislocation-driven and transformation-induced deformation mechanisms and volumetric changes. The validated model is used to study the competition between slip and transformation and the influence of microstructure on martensite formation.