Martensite phase transformation in metastable fully austenitic steel under high strain rate deformation
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This essay discussed the influence of chemical composition, strain rate and grain size on martensite phase transformation in metastable fully austenitic stainless steel. Electron Back Scattering Microscopy (EBSD) was used to characterize the microstructure of samples and Split Hopkinson compression bar was applied to study the mechanical behavior of fully austenitic stainless steel under high strain rate deformation. The experiment results indicate that even tiny different Ni content can influence the stability of austenite under high strain rate deformation. Higher strain rate deformation makes the stainless steel’s work-hardening larger low strain rate deformation. At last, grain size can significantly increase the austenite phase’s stability under high strain compression deformation. To further study the dynamic mechanical behaviors of metastable fully austenitic steel, Split Hopkinson tension bar is needed, and that is the major task for future work.