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

Abstract

C−Mn segregation and its effect on phase transformation and plastic deformation in Fe−Mn−C alloys were studied through the calculation of valence electron structure, the microregion composition detection and TEMinsitu dynamic tensile deformation test. The experimental results show that in Fe−8Mn-1.2C alloyed austenite,n A of units with C−Mn involved is 3.98 times that of units without C involved and 1.4 times that of units with C involved;n C D of units with C−Mn involved is 2.21 times that of units with C involved. In Fe−Mn−C alloyed austenites, there exists microsegregation of C−Mn, forming the randomly distributed Fe−Mn−C atomic cluster segregation zone linked with the −C−Mn−C−Mn− strong bond network, which will effectively slow down the motion of atoms and retard the initiation of the slip system and the movement of dislocation, and thus will severely influence the phase transformation and deformation of the alloy.