节镍型高氮奥氏体不锈钢的动态再结晶行为  

Dynamic recrystallization behavior of low-nickel high nitrogen austenitic stainless steel

作　　者：张彩军 嵇爽 赵英利 张雲飞 胡加佳 

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]河钢集团钢研总院,河北石家庄050000

出　　处：《金属热处理》2017年第7期31-34,共4页Heat Treatment of Metals

基　　金：河北省科技计划(15211007D)

摘　　要：对节镍型高氮奥氏体不锈钢在不同应变速率、不同变形温度下进行热变形模拟试验,并根据试验数据绘制应力-应变曲线。利用加工硬化率θ与应力-应变σ的曲线拐点和-dθ/dσ-σ曲线最小值点判定动态再结晶开始状态。确定动态再结晶临界应力σ_c和临界应变ε_c。同时计算出临界应变ε_c与峰值ε_p间的关系:ε_c≈0.378ε_p。构建出节镍型奥氏体不锈钢动态再结晶临界应变预测模型:lnε_c=0.026 85lnZ-4.7358。Thermal deformation simulation tests were carried out under different deformation temperatures and different strain rates,and the flow stress curves were plotted based on experimental data. Using the inflection point of work hardening rate θ-flow stress σ curve and the minimum point of-dθ/dσ-σ curve to determine the beginning condition of a dynamic recrystallization. Then both the dynamic recrystallization critical stress σcand the critical strain εcwere determined,and a relationship between critical strain εcand peak strain is found：ε_c≈ 0. 378ε_p. A predictive model of dynamic recrystallization of low-nickel high nitrogen austenitic stainless steelis built as：lnε_c=0. 026 85 lnZ-4. 7358.

关 键 词：节镍型高氮奥氏体不锈钢 动态再结晶 临界应变 微观组织 应力曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]