高强度奥氏体不锈钢中析出相的热力学计算与试验分析  

Thermodynamic calculation and experimental analysis on precipitated phase in high-strength austenitic stainless steel

作　　者：俞占扬 信瑞山 曹晨星 王建强 姚斌 王利伟[2] 赵吉庆[3] Yu Zhanyang;Xin Ruishan;Cao Chenxing;Wang Jianqiang;Yao Bin;Wang Liwei;Zhao Jiqing(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102211,China;Pangang Group Jiangyou Changcheng Speical Steel Co.,Ltd.,Jiangyou Sichuan 621700,China;Research Institute of Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102211 [2]攀钢集团江油长城特殊钢有限公司,四川江油621700 [3]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2025年第4期89-94,共6页Heat Treatment of Metals

摘　　要：基于Thermo-Calc热力学软件计算了新型高强度奥氏体不锈钢的平衡相图及析出相中元素含量变化,同时结合SEM和TEM分析方法,对固溶处理试验钢中析出相类型进行判定,并计算了钢中C、Nb、V、N、Ni、Mo、Cr和Mn元素含量变化时析出相的析出温度和析出量。结果表明,经固溶处理后,新型高强度奥氏体不锈钢中析出相主要为大尺寸棒状析出相和细小球状析出相,均为Z相。Z相主要受C、Nb、V、N元素的影响,随C、V含量增加,Z相析出温度降低;随Nb、V含量增加,其析出量增加;随着N含量增加,Z相析出量降低。Ni、Mo、Cr和Mn元素对Z相的析出影响较小。综合考虑元素在材料中的固溶强化、析出强化作用和对晶界腐蚀的影响,在成分范围内,C、Nb和N元素是试验钢成分优化的重点。Equilibrium phase diagram and element content changes in precipitated phases of a novel high-strength austenitic stainless steel were calculated based on Thermo-Calc thermodynamic software.At the same time,the types of precipitated phase in the solution treated steel were determined by SEM and TEM,and the precipitation temperature and amount of the precipitated phase were calculated when the contents of C,Nb,V,N,Ni,Mo,Cr and Mn elements in the steel changed.The results show that after solution treatment,the precipitated phases in the steel are mainly large-sized rod-shaped precipitated phases and fine spherical precipitated phases,both of which are Z phases.The Z phase is primarily affected by C,Nb,V and N elements.As the content of C and V increases,the precipitation temperature of the Z phase decreases.As the content of Nb and V increases,the amount of Z phase precipitation increases.Conversely,as the content of N increases,the amount of Z phase precipitation decreases.The Ni,Mo,Cr,and Mn elements have a relatively minor impact on the precipitation of the Z phase.Considering the solution strengthening and precipitation strengthening effects of elements in the material,as well as their impact on grain boundary corrosion,within the composition range,C,Nb and N elements are the key focuses for optimizing the composition of the steel.

关 键 词：高强度奥氏体不锈钢 热力学计算 平衡相图 析出相 

分 类 号：TG111.3[金属学及工艺—物理冶金]