Abstract
The characteristics of the martensitic transformations induced by uniaxial tensile tests performed between room temperature and 200°C in two Fe-Mn-Cr alloys with different Cr contents were examined. Different volume fraction of α’ martensite and ɛ martensite were detected in the austenitic matrix as the function of parameters of the thermo-mechanical treatments. Quantitative and qualitative phase analyses by X-ray diffraction were carried out on the samples. The crystallographic orientation (texture) of the phases on macro scale was also determined. The decomposition of ɛ martensite was followed by DSC measurements. It was found that increasing Cr content increased the stability of austenite, thus, increased the stacking fault energy. The increased Cr content also suppressed the formation of α’ martensite. Deformation of austenite stabilized the austenite phase and led to the formation of textured ɛ martensite.
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