Abstract
The transformation induced plasticity (TRIP) effect is investigated during a load path change using a cruciform sample. The transformation properties are followed by in-situ neutron diffraction derived from the central area of the cruciform sample. Additionally, the spatial distribution of the TRIP effect triggered by stress concentrations is visualized using neutron Bragg edge imaging including, e.g., weak positions of the cruciform geometry. The results demonstrate that neutron diffraction contrast imaging offers the possibility to capture the TRIP effect in objects with complex geometries under complex stress states.
Highlights
The preferred deformation mechanisms in austenitic stainless steels strongly depend on the stacking fault energy (SFE) [1,2,3]
A cruciform sample of austenitic stainless steel was subjected to uniaxial load path change
transformation induced plasticity (TRIP) effect is suppressed upon the initial uniaxial loading; upon loading the second direction, a significant amount of martensite appears
Summary
The preferred deformation mechanisms in austenitic stainless steels strongly depend on the stacking fault energy (SFE) [1,2,3]. When the SFE is sufficiently low, the transformation induced plasticity (TRIP) effect occurs upon deformation [4]. Several studies have focused on the investigation of the TRIP effect in this class of materials under different monotonic load paths. Sheet metals and alloys are often subjected to biaxial loadings and load path changes (LPCs) during their forming processes. The mechanical behavior of TRIP steels under LPCs is poorly understood. The existing transformation kinetic models fail to predict the TRIP effect evolution upon LPCs as they typically only account for the cumulative strain upon monotonic loading
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