304 스테인리스강의 열간동적재결정과 미세조적 예측에 대한 연구

Abstract

The flow stresses of 304 stainless steel during hot forming process were determined by conducting hot compression tests at the range of 1273 K ∼ 1423 K and 0.05 /s ∼ 2.0 /s as these are typical temperature and strain rate in hot forging operation. In the material Dynamic recrystallization was found to be the major softening mechanism with this conditions as previous studies. Based on the observed phenomena, a constitutive model of flow stress was assumed as a function of strain, strain rate, temperature. In the constitutive model, the effects of strain hardening and dynamic recrystallization were taken into consideration. A finite element method connected to constitutive model was performed to predict the dynamic recrystallization behaviors and also stress-strain curves in hot compression of 304 stainless steel.