节镍型高氮奥氏体不锈钢热变形行为的研究  

Research on Hot Deformation Behavior of Low-nickel High Nitrogen Austenitic Stainless Steel

作　　者：张雲飞 赵英利 常金宝 嵇爽 王程明 Zhang Yunfei;Zhao Yingli;Chang Jinbao;Ji Shuang;Wang Chengming(Hesteel Group Technology Research Institute,Shijiazhuang Hebei 050000,China)

机构地区：[1]河钢集团钢研总院,河北石家庄050000

出　　处：《上海金属》2018年第6期19-23,共5页Shanghai Metals

基　　金：河北省科技计划项目(No.15211007D)

摘　　要：利用Gleeble-3800热/力模拟机对节镍型高氮奥氏体钢进行了不同温度(950～1 200℃)及应变速率(0. 01～10 s^(-1))下的高温压缩试验。研究了变形条件对该钢种的高温流变应力的影响规律,并观察了压缩变形后钢的显微组织。结果表明,应变速率相同,随着变形温度的升高,流变应力逐渐降低,950℃动态再结晶开始,1 200℃时发生完全动态再结晶。变形温度相同,随着应变速率的降低,流变应力逐渐降低,表明动态软化的时间越长。说明在试验钢的热变形温度范围内,降低应变速率及提高变形温度均有利于减弱因变形而产生的加工硬化,软化机制逐渐由动态回复向动态再结晶转变。The high temperature compression test at temperatures from 950℃to 1 200℃and strain rates from 0.01 s-1 to 10 s-1 for low-nickel high nitrogen austenitic stainless steel was carried out by using Gleeble-3800 thermo-mechanical simulation machine.The effect of deformation conditions on the high temperature flow stress of the steel was researched,and the microstructure of the steel under different deformation parameters was analyzed.The results showed that under the same strain rates,the flow stress decreased gradually with the increase of temperature.Dynamic recrystallization started at deformation temperature of 950℃and complete dynamic recrystallization occurred at 1 200℃.Under the same deformation temperatures,the flow stress decreased gradually with the strain rate decreased,indicating longer time for dynamic softening.It was explained that in the range of hot deformation temperature of test steel,the reduction of the strain rate and the increase of the deformation temperature was beneficial to weakening the work hardening caused by deformation,and the softening mechanism gradually changed from dynamic recovery to dynamic recrystallization.

关 键 词：节镍型高氮奥氏体不锈钢 高温变形 流变应力 微观组织 

分 类 号：TG142.71[一般工业技术—材料科学与工程]