In situ crystallographic observation of dynamic recrystallization evolution during warm compression of martensite steels

Xu, P. G.   ; Tomota, Yo*; Li, J.*; Oliver, E. C.*; Adachi, Yoshitaka*

The dynamic recrystallization evolution of two martensite steels 17Ni-0.2C and 2Mn-0.2C during warm compression were investigated by neutron diffraction. For 17Ni-0.2C, the warm compression at 773K promoted the austenite precipitation from the martensite matrix. The austenite deformation texture gradually increased. For the ferrite, the deformation texture component first increased and then become stable or weak to a certain extent because of the onset of recrystallization texture component. For 2Mn-0.2C, the proper tempering treatment at 873K led to the occurrence of static recovery of martensite to a certain extent and the precipitation of cementite. The onset of ferrite dynamic recrystallization in 2Mn-0.2C was at a higher nominal strain than that in 17Ni-0.2C. It was believed that this difference was mostly related to the different volume fraction of hard second phase.