Dynamic Recrystallization of a Cr-Ni-Mo-Cu-Ti-V Precipitation Hardenable Stainless Steel

In this research, the dynamic recrystallization (DRX) behavior of an as-cast precipitation hardenable (PH) stainless steel was investigated by conducting hot compression tests at temperatures between 950–1150oC and under strain rates of 0.001–1 s-1. The flow stress curves show that the DRX is responsible for flow softening during hot compression. The effects of temperature and strain rate on the strain and stress corresponding to peak point (ξp and θp) of flow curve were analyzed individually. It is realized that, they increase with strain rate and decrease with temperature. The relationship between Zener-Hollomon parameter (Z) and ξp was investigated and the equation ofξp =4.3×10-4Z0.14 was proposed. The strain for the maximum rate of DRX (ξmax) was determined under different deformation conditions. Therefore, it is realized that it increases with Z parameter and vise versa. On the basis of obtained results, the equation ofξmax =9.5×10-4Z0.12 was proposed.