C-Mn segregation and its effect on phase transformation in Fe-Mn-C alloys

C-Mn segregation and its effect on phase transformation in Fe-Mn-C alloys w ere studied through detection of microregion composition, calculation of va lence electron structure, and TEM in-situ observation on the thin film tens ile deformation. The experimental results show that there exists C-Mn micro segregation in the alloy. Due to the strong bond force between C and Mn, C- Mn cluster can effectively bind up the motion of atoms and severely retard the transformation from austenite to martensite. Martensite and that strain induced preferentially nucleate in the region of lower C-Mn content and th eir growth is retarded in the region with high C-Mn content and with strong er resistance on lattice reconstruction.