氮含量对高氮不锈钢硬化和软化特性的影响  

Effect of nitrogen contentration on hardening and softening properties of high nitrogen stainless steel

作　　者：宁小智[1] 邢长军[1] 雍歧龙[1] 吴林[1] NING Xiao-zhi;XING Chang-jun;YONG Qi-long;WU Lin(Institute of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院工程用钢研究所,北京100081

出　　处：《钢铁》2021年第3期66-70,共5页Iron and Steel

摘　　要：为了研究高氮奥氏体不锈钢的加工硬化和退火软化的现象,设计并冶炼了氮质量分数为0.02%~1.20%的无镍奥氏体不锈钢,通过力学性能测试、SEM、EBSD等显微组织观察,分析氮含量对加工硬化和退火软化影响机理。结果表明,氮元素的添加大幅提升了加工硬化速率,氮质量分数从0增加到1.2%,加工硬化率提高了7.06MPa/%。氮能够促进再结晶形核,有效细化晶粒尺寸,氮质量分数为0.4%~1.2%时晶粒细化达60%,但会阻碍晶粒动态回复。High-nitrogen nickel-free austenitic stainless steels with different mass percent of nitrogen from 0.02% to 1.20% were designed and melted.The effect of nitrogen on work hardening and annealing softening were investigated through mechanical properties test and microstructure examination.The results show that nitrogen enhances the rate of work hardening.The work hardening rate increased 7.06 MPa/% when the mass percent of nitrogen raise from 0 to 1.2%.Nitrogen can promote recrystallization nucleation,refine grain size effectively.The grain refined 60% with mass percent of nitrogen adds from 0.4% to 1.2%,but it can diversify grain orientation.

关 键 词：氮含量 高氮钢 加工硬化 退火软化 位错 

分 类 号：TG142.71[一般工业技术—材料科学与工程]