In situ investigation on the deformation-induced phase transformation of metastable austenite in Fe-13% Cr-4% Ni martensitic stainless steel

Deformation-induced phase transformation (DIPT) of metastable austenite in Fe-13% Cr-4% Ni steel occurs during the macroscopic elastic stage and is accompanied by the yielding of metastable austenite at microscopic level. The DIPT rate is accelerated by yielding the martensite matrix, which increases the available nucleation sites for DIPT by enhancing the plastic deformation in austenite.