The study of the planar defects of the nano-sized retained austenite in Mn-Si-Cr steel

Abstract

The morphology and crystallographic features of the nano-sized retained austenite (RA) in low carbon Mn-Si-Cr steel were explored in the present work. The nano-sized RA between the sub-laths inside the martensite laths is perpendicular to the lath boundary and shows particular long-axis direction, i.e. (3 5 1)γ. The stacking faults connected with the dislocation outcrops on the interfaces are observed in the nano-sized RA. The phase transformation stress accompanying the martensitic transformation can induce plastic deformation by the slip of both the stacking faults in the nano-sized RA and the Shockley partial dislocations in the interface.