Dynamic recrystallization behavior of superaustenitic stainless steel containing of 16%Cr and 25%Ni

The dynamic recrystallization (DRX) of superaustenitic austenitic stainless steel containing of 16%Cr and 25%Ni was studied with compression test in the temperature range of 900 1200°C and the strain rate range of 0.001-1s-1. The initiation and evolution of DRX were investigated with microstructural analysis and then The effect of the deformation variables (T, ) on these values is analyzed; it is shown that over a range of temperature corrected strain rate (Z=1013.5 to 1015s-1), the initiation of dynamic recrystallization is delayed. This retardation is attributed to the segregation of substitutional impurity elements, principally phosphorus, to the subboundaries of the newly-forming DRX grains. The mean activation energy regarding the hot deformation of 16%Cr and 25%Ni was about 425 kJ/ mol.

کلیدواژه ها:

Hot deformation ، Dynamic recrystallization ، Work hardening rate ، Critical strain