增氮降镍对316不锈钢热变形行为的影响

Effects of increasing nitrogen and reducing nickel on hot deformation behavior of 316 stainless steel

在变形量为60%,应变速率为0.01~0.1 s-1,变形温度为950~1100℃的条件下,利用Gleeble-1500D热模拟机对不同成分316不锈钢进行了单道次压缩试验,通过分析真应力-真应变曲线、变形后组织、热变形激活能,得到增氮降镍对试验钢热变形行为的影响。结果表明,在热变形条件下,试验钢均发生了动态再结晶;增氮降镍后,提高了试样的变形抗力,其热变形激活能显著增加,由420.26 k J·mol-1分别提高到514.28和473.7 k J·mol-1,抑制了动态再结晶的发生。

The influence of reducing nickel and increasing nitrogen on hot deformation behavior of 316 stainless steel was obtained by analyzing the true strain-stress curve,microstructure,thermal deformation activation energy via the single-pass compression tests on a Gleeble-1500 D thermomechanical simulator at temperature of 950-1100 ℃,strain rate of 0. 01-0. 1 s-1and deformation of 60%. The results show that: the flow strain-stress curves are the type of dynamic recrystallization under different deformation conditions,the deformation resistance of the investigated steels increases with increasing nitrogen and reducing nickel,the nominal activation energy of dynamic recrystallization is increased from 420. 26 k J·mol-1to 514. 28 k J·mol-1and 473. 7 k J·mol-1,the occurrence of dynamic recrystallization is inhibited.