Abstract: Tensile hot deformation behavior and structure change of high nitrogen austenite stainless steel Mnl6Cr22Nil. 6N0. 6 (%： 0.12C, 22.05Cr, 15.52Mn, 1.64Ni, 0. 58N) with strain rate 0.005 s^-1 at 900 ~ 1 300 ℃ have been studied by Gleeble 1500D thermal simulator. Results show that the high nitrogen steel has nice plasticity at 1 100 ~ 1 250 ℃ with the maximum reduction of area is 59% at 1 220 ℃. The observations on structure at tensile fracture show that as the steel tensions at 900 ~ 1 000 ℃ the recrystallization occurs with forming fine grains, at 1 000 ~ 1 100 ℃ the recrystallized grain grows with serrated grain boundary, at 1 100 〜1 300 ℃ the ferrite occurs and with increasing temperature the amount of ferrite increases, and at 1 300 ℃. the melting phenomena of grain boundaries occurs.

Key words: High Nitrogen Austenite Stainless Steel, Hot Deformation Behavior, Structure

摘要： 通过Gleeble 1500D热模拟实验,研究了Mn16Cr22Ni1.6N0.6高氮奥氏体不锈钢(%:0.12C、22.05Cr、15.52Mn、1.64Ni、0.58N)在900～1 300℃,应变速率(ε)0.005 s-1时拉伸热变形行为及其组织变化。结果表明,该高氮钢在1 100～1 250℃时塑性较好。1 220℃断面收缩率最大为59%。拉伸断口处组织的观察表明,900～1 000℃拉伸时,已发生再结晶,有较细的晶粒生成;1 000～1 100℃时,再结晶的晶粒长大,有锯齿状的晶界;1 100～1 300℃时有铁素体出现,而且随温度的升高,铁素体含量增多,1 300℃时晶界发生了融化现象。

关键词: 高氮奥氏体不锈钢, 热变形行为, 组织