|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||S-3: Transmission Electron Microscopy Study of Deformation-Induced Martensitic Transformation in 304 Stainless Steel using In-situ and Ex-situ characterization.
||Djamel Kaoumi, Junliang Liu
|On-Site Speaker (Planned)
The deformation-induced martensitic transformation was studied in metastable 304 austenitic stainless steel. Tensile tests were conducted at 25C under a strain rate of 10-3 s-1. Following rupture, the fractured area was examined under TEM evidencing the phase transformation. Some tests were also interrupted after reaching intermediate strain levels, with the goal of investigating the intermediate microstructure. In complement to the ex-situ investigation, tensile tests were conducted in-situ in a TEM at 25°C down to cryogenic temperatures (-100°C) using a special straining-stage with the goal of capturing the growth of the martensitic phase as it develops under stress in the material and capture it on video. The presentation will report the observations and analysis evidencing the mechanisms of the phase transformation from γ-austenitic to ε-martensite (HCP) and α’-martensite (BCC). The formation of stacking faults and subsequent ε-martensite was captured in-situ. Upon further straining, ε-martensite may continue to transform into α’-martensite.
||Planned: A print-only volume