Analysis of Tensile Deformation Behavior by in situ Neutron Diffraction Experiments of 1 GPa-grade TRIP Steels with High Elongation

Abstract

The better uniform elongation of the 1 GPa-grade TRIP-aided multi-phase steel with retained austenite (γ_R) shape of needle-like was discussed by in situ neutron diffraction experiments during tensile test. The better uniform elongation can be ascribed by not only the deformation-induced martensitic transformation of γ_R but also the deformation behavior of γ_R and ferrite phase. Especially, the tensile deformation behavior of γ_R is found to be closely associated with both of the stress-strain curve and the deformation-induced martensitic transformation of γ_R. The tensile deformation behavior of γ_R should be considered as one of the conditions to obtain better TRIP effect.