氮含量对1Cr17Mn6Ni5N奥氏体不锈钢高温变形行为的影响

Effect of Nitrogen Content on Behavior of Elevated Temperature Deformation of Austenite Stainless Steel 1Cr17Mn6Ni5N

试验用1Cr17Mn6Ni5N钢(/%:0.09~0.11C,0.19~0.29Si,7.33~7.42Mn,0.011~0.015P,0.004~0.007S,16.87~17.24Cr,,5.06~5.19Ni,0.21~0.40N)由10kg真空感应炉熔炼,通过氮气气氛加氮化铬进行N合金化。通过Gleeble-1500D热模拟试验机将实验钢在真空下1150~1 000℃,以应变速率10^(-2)s^(-1)和1 s^(-1)进行压缩60%试验。结果表明,在高温下,以低应变速率压缩时钢的动态再结晶是主要的软化机制;以高应变速率压缩时钢的动态回复是主要的软化机制;与0.21%N和0.29%N试验钢相比,含0.40%N的试验钢具有较高的峰值应力,根据Zener-Hollomon参数的计算得出0.40%N的试验钢再结晶激活能最高,在高温下不易发生动态再结晶。

The test steel 1Crl7Mn6Ni5N （/% ： 0.09 -0. llC, 0. 19 ~0. 29Si, 7.33 -7.42Mn, 0.011 -0.015P, 0. 004 ~0. 007S, 16. 87 ~ 17.24Cr, 5.06 -5.19Ni, 0. 21 ~0.40N） is melted by a 10 kg vacuum induction furnace with adding chromium nitride to N-alloying in nitrogen atmosphere. The compression 60% experiment of test steel in vacuum with strain rate 10^-2 s^-1 and 1 s-1 at 1 150 - 1 000 ℃ has been carried out by using Gleebl-1500D thermo-mechanical sim- ulation machine. Test results show that at high temperature with lower strain rate the dynamic recrystallization of steel is main softening mechanism and with higher strain rate the dynamic recovery of steel is the main softening mechanism; as compared with 0. 21% N and 0. 29% N test steels the 0.40% N test steel has higher peak stress, and based on the calcula- tion of Zener-Hollomon parameter, the reerystallization activation energy of 0. 40% N test steel is highest, uneasily to hap- pen dynamic crystallization at elevated temperature.