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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
Presentation Title Effect of Complex Strain Paths on Microstructure Evolution Studied by In-situ Neutron Diffraction
Author(s) Steven Van Petegem, Tobias Panzner, Manas Upadhyay, Helena Van Swygenhoven
On-Site Speaker (Planned) Steven Van Petegem
Abstract Scope 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.
Proceedings Inclusion? Planned: A print-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel In-situ Planar Biaxial Experiment
Advanced Cruciform Testing at the NIST Center for Automotive Lightweighting
An Experimental and Microstructural Investigation of Biaxial Bauschinger Effects in Sheet Metals
An Experimentally Validated, Microstructure Based Model for Forming of Low-symmetry Alpha-uranium
Biaxial Loading of Anisotropic Al-6022-T4 Sheets Using Cruciform Specimens
Determination of Bending Limit Curves for Aluminium Alloy AA6014-T4: An Experimental Approach
Dilational Response of Voided Polycrystals
Effect of Complex Strain Paths on Microstructure Evolution Studied by In-situ Neutron Diffraction
Evalution of Formability in Aluminum Alloys across Strain Rates Using Digital Image Correlation Technique
Hardening Behavior of 316L SS Subject to Biaxial Strain Path Change: Multiscale Modeling for Guiding Experiments
Inflation of Stainless Steel 304L Microtubes under Axial Tension and Internal Pressure to Assess the Plastic Anisotropy
Modeling Anisotropic Hardening and Nonlinear Elasticity under Loading Path Change
Multi-scale Analysis of Springback in Microforming of Thin Nickel Sheets
On the Non-proportional Deformation of Sheet Steel Using In-situ Diffraction and Modelling Methods
Onset of Plasticity via Relaxation Analysis (OPRA)
Optimization of Biaxial Tensile Test Specimen Design
Predicting Cyclic Deformation of AA6022-T4 and DP590 Using Polycrystal Plasticity
Sensitivity Analysis of the Bauschinger Behavior on Bending Springback for Prestrained Sheets
The Influence of Deformation Mechanisms on Forming of Commercially Pure Titanium Sheets

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