论文部分内容阅读
利用Gleebe-1500型热模拟试验机研究一种“人体友好型”高氮无镍奥氏体不锈钢的热变形行为和动态再结晶规律,试验条件为变形温度900~1100℃、应变速率0.001~10s-1。结果表明,随变形温度升高,峰值应力和流变应力逐渐减小,动态再结晶速率增加;在变形温度不变的条件下,随变形速率的降低,峰值应力和流变应力降低;在变形速率为0.01、0.001s-1时,变形后期发生二次加工硬化;通过数值分析计算得出热变形激活能为280.09 k J/mol,并列出高氮无镍奥氏体不锈钢的热变形方程。
The hot deformation behavior and dynamic recrystallization of a “human-friendly” high-nitrogen, nickel-free austenitic stainless steel were investigated by using a Gleebe-1500 thermal simulator. The experimental conditions were as follows: deformation temperature 900 ~ 1100 ℃, strain rate 0.001 ~ 10s-1. The results show that with the increase of deformation temperature, the peak stress and the flow stress gradually decrease and the dynamic recrystallization rate increases. Under the same deformation temperature, the peak stress and the flow stress decrease with the decrease of the deformation rate. At 0.01,0.001 s-1, the secondary work-hardening occurred in the late stage of deformation. The thermal deformation activation energy was calculated by numerical analysis to be 280.09 kJ / mol, and the thermal deformation equations of the high-nitrogen nickel-free austenitic stainless steel .