Strain partitioning and texture evolution during cold rolling of AISI 201 austenitic stainless steel

摘要

AISI 201 stainless steel; Cold rolling; Strain-induced martensite; Strain partitioning; Texture%Strain partitioning and texture evolution of AISI 201 austenitic stainless steel were investigated upon cold rolling up to a true strain of ε = 0.92. ε-martensite formation is the main work hardening mechanism at low strains (ε = 0.11). With increasing strain, the volume fraction of a'-martensite increases with a sigmoidal-like behavior. Remaining untransformed austenite is intensely fragmented by mechanical microtwins. The in-grain mis-orientation increases for all phases up ε = 0.51 and then levels off for further strain. Strain partitions evenly between austenite and a'-martensite during cold rolling. X-ray texture measurements revealed that austenite develops Goss, Brass and S texture components up to the largest investigated strain. The presence of Brass component at the highest deformation seems to be assisted by mechanical twinning. The texture components of a'-martensite belong to the a- and y- fibers. Texture evolution of e-martensite was followed by electron back-scatter diffraction data and results show that texture evolves up to ε = 0.51 and remains nearly unchanged at larger strains, similarly as observed for austenite and a'-martensite.