Abstract
The effect of high-pressure torsion (HPT), including a new method of accumulative HPT (AccHPT), on the microstructure and mechanical properties of Fe-30Mn-5Si alloy is studied. It is shown that during HPT and AccHPT, stress-induced ε-martensite is predominantly formed, and a mixture of nanograined structure, nanosubgrained structure and highly-dislocated substructure after HPT, while predominantly nanograined structure after AccHPT, are obtained. The increase in the number of HPT revolutions results in a broadening of the X-ray diffraction lines and higher microhardness values. The highest values were achieved on samples after AccHPT.
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