Abstract
We report on the changes in microstructure and phase composition in a high-Mn steel due to severe plastic deformation realized via high pressure torsion at different temperatures. Severe straining conducted at 20°C and 300°C allowed producing nanostructural states with a mean grain size less than 100nm. Besides, straining at room temperature leaded to formation of strain-induced ε-martensite while at 300°C fully austenite state was produced. Despite the revealed differences both states demonstrated similar, notably increased level of hardness up to ∼580Hv.
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