|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
||Effect of Complex Strain Paths on Microstructure Evolution Studied by In-situ Neutron Diffraction
||Steven Van Petegem, Tobias Panzner, Manas Upadhyay, Helena Van Swygenhoven
|On-Site Speaker (Planned)
||Steven Van Petegem
Current state-of-the-art crystal plasticity models often fail to correctly describe the macroscopic response of metals subjected to complex strain path changes. To optimize such models, experimental input at a microstructural level is needed. In-situ x-ray and neutron diffraction are often used to study the evolution of intergranular and intragranular stresses during plastic deformation. Unfortunately, most studied are restricted to uniaxial deformation.
We present a biaxial deformation rig that can be used for in-situ proportional and non-proportional testing during neutron diffraction at POLDI (SINQ). We apply this method on 316L steel, which exhibits transient softening when changing the strain path. We investigate the evolution of the microstress as a function of the angle between the plastic strain rate tensors of both loading directions. The nature and magnitude of intergranular strain depends on the applied stress state and demonstrate that micro yielding and internal strain recovery are responsible for the transient softening.
||Planned: A print-only volume