Monitoring martensitic transformation and the strengthening behavior during tensile deformation in TRIP steel using neutron diffraction

中性子回折を用いたTRIP鋼の引張変形中のマルテンサイト変態及び強化挙動の観察

Harjo, S.   ; 土田 紀之*; 阿部 淳*; 川崎 卓郎   

Harjo, S.; Tsuchida, Noriyuki*; Abe, Jun*; Kawasaki, Takuro

TRIP steels contain several tens of percent of metastable retained austenite () that transform to martensite (') during deformation, leading to the improvement of strength and ductility. Deformation induced martensitic transformation behavior and its effect on the strengthening mechanism in two TRIP-aided multiphase steels with different carbon contents (0.2 and 0.4 wt.%) were monitored using in situ neutron diffraction experiments during tensile tests to clarifying the effect of TRIP on the improvement of strength. The results suggest that ' plays an important role in increasing the strength during tensile deformation.