Formation of fully austenitic ultrafine-grained high strength state in metastable Cr-Ni-Ti stainless steel by severe plastic deformation

The present research establishes a possibility of producing nano- and submicrocrystalline structure in fully austenitic state of the metastable Cr-Ni-Ti steel after high pressure torsion (HPT) by raising the temperature of severe plastic deformation above the treshold value for strain-induced martensite transformation, and at room temperature by reducing the temperature of strain-induced martensite transformation with the grain size decreases during step-by-step decreasing HPT temperature.