|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Late News Poster Session
||O-43: Microstructural Evolution during Deformation of 1 GPa Ultrahigh Strength-high Ductility Combination Austenitic Low Density Steel
||Devesh Misra, Jaehyun Kim, L. Wei
|On-Site Speaker (Planned)
Low density steels are of significant interest because of light weight combined with high strength and ductility. We describe here the microstructural evolution during deformation of a low density steel characterized by tensile strength and elongation of 1125 MPa and 30.8%, respectively, via using post-mortem electron microscopy and electron back scattered diffraction of the deformed region. The plastic deformation was accommodated by pronounced planar dislocation slip and is attributed to the superposition of sheared ordered kappa precipitates and short-range ordering. Dynamic slip band refinement and shearing of precipitates led to constant strain hardening of the austenitic steel.