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

摘要

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.