|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Experimental Determination of Magnitude of Shear of Stacking Faults, Twins and Alpha’-martensite in TRIP/TWIP Steels
||Anja Weidner, Horst Biermann
|On-Site Speaker (Planned)
Modern CrMnNi TRIP/TWIP steels exhibit deformation-induced martensitic phase transformation or mechanical twinning depending on the austenite stability and the stacking fault energy. Although the magnitude of shear for epsilon-martensite and twins are known from theoretical considerations, up to now the experimental determination of the individual local shear strain values associated with different mechanisms like alpha’-nuclei or mechanical twins is still missing. An excellent method for the experimental determination of individual strain levels is the performance of quasi in situ deformation experiments in a scanning electron microscope complemented by the application of high-resolution digital image correlation. The results of image correlation show significant difference in the formation of local strain fields depending on the primary deformation mechanism. Moreover, the magnitude of shear for individual constituents of the microstrucutre like deformation bands, alpha’-martensite or mechanical twins were calculated. Furthermore, the magnitude of shear of alpha’-martensite depends significantly on their crystallographic orientation.
||Planned: Supplemental Proceedings volume