High temperature deformation behavior and corrosion resistance of 2205 duplex stainless steel under strain rate of 0.5s-1

摘要

Under strain rate of 0.5s-1,the effect of deformation temperature on flow stress,microstructure and corrosion resistance of 2205 duplex stainless steel (DSS) was investigated.The dynamic recrystallization (DRX) of austenite phase was enhanced with the deformation temperature increasing from 850°C to 1050°C,meanwhile,the leading deformation mechanism changed from work hardening to DRX.When the deformation temperature was further increased to 1250°C,the dynamic recovery (DRV) of ferrite phase played a leading role.The specimen after deformation at 1050°C exhibited better DRX behavior,which leads to more γ/γ grain boundaries and δ/γ,boundaries formation,increasing the occurrence of pitting corrosion,and it presented best corrosion resistance at 950°C.