Hot deformation behavior and dynamic recrystallization mechanism of F316 austenitic stainless steel
The hot deformation behavior and dynamic recrystallization(DRX)mechanisms of F316 austenitic stainless steel for nuclear-grade valves were systematically investigated by isothermal compression tests at different deformations(10％-50％),temperatures(960-1 120 ℃),and strain rates(0.1-1s-1).The results show that the bulge nucleation is the main nucleation mechanism of DRX.Both the increasing strain rate and decreasing deformation temperature led to the gradual decrease in the volume fraction and grain size of DRX.The constitutive equation of F316 austenitic stainless steel was established by combining with the Arrhenius equation and Zener-Hollomon parameters.The deformation activation energy was determined as 491.54 kJ/mol,and the peak stress significantly increases with the increasing deformation temperature and the decreasing strain rate.The constitutive equation was further modified by considering the effects of strain,and a good prediction on the stress-strain curves of F316 stainless steel was successfully achieved.
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