|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Secondary Deformation Density of a TWIP-TRIP Steel Strained at High Rates
||Jake Benzing, Whitney Poling, Dean Pierce, Kip Findley, James Wittig
|On-Site Speaker (Planned)
This research utilizes conventional and high-resolution transmission electron microscopy [HR-TEM], controlled electron channeling contrast imaging [c-ECCI] and electron backscattered diffraction [EBSD] to quantify the density of secondary deformation in a high Mn steel. The Fe-25Mn-3Al-3Si alloy possesses an intermediate stacking fault energy [SFE] of 21±3 mJm-2, which promotes twinning and transformation-induced plasticity [TWIP-TRIP]. These deformation mechanisms provide obstacles to subsequent dislocation motion and exhibit superior mechanical energy absorption, (high strength, formability and strain hardening). This study focuses on the mechanical properties during high strain rate (10 – 10,000 s^-1) deformation. Adiabatic heating is measured in situ with a high frame rate thermal camera and enables modeling of SFE increase, with respect to temperature. Tests are conducted to failure and also interrupted to allow for characterization of the TWIP-TRIP evolution. While TEM yields excellent contrast and orientation information for the secondary deformation, c-ECCI and EBSD provide improved statistics for quantification.
||Planned: EPD Congress Volume