Influence of Warm Deformation on Strain-Induced Martensite Behavior of 316L Stainless Steel

摘要

In order to control the ratio of nano/ultrafine structure grains of warm/cold rolled 316L stainless steel after annealing, the influence of deformation amount and temperature on martensite content and microstructure was investigated, and a model of the content of stain-induced martensite and deformation amount and temperature was established. Results showed that the content of staininduced martensite was nonlinear with deformation amount, but with an incubation period. And it's generally exponential. Martensitic transition occurred in large deformation stage. 58.23% straininduced martensite was formed when deformation amount was 80% at 200°C. The content of martensite is the most significant factor that affects austenite grain size after annealing. With more strain-induced martensite, the average austenite grain size decreased, and the uniformity of grain size was improved, which was generally monotonous.