固溶处理对粉末注射成形高氮无镍不锈钢组织和性能的影响  

Effects of solution treatment on the microstructures and properties of high nitrogen nickel-free stainless steel prepared by MIM

作　　者：邹黎明 刘瑞洋 蔡瑛 倪东惠[4] Zou Liming;Liu Ruiyang;Cai Ying;Ni Donghui(School of Intelligent Manufacturing,Guangzhou Vocation College of Technology and Business,Guangzhou 511442,Guangdong,China;Ansteel Real Estate Construction Group Co.,Ltd.,Anshan 114000,Liaoning,China;Guangzhou Goldensouth Magnetic Materials Co.,Ltd.,Guangzhou 511328,Guangdong,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,Guangdong,China)

机构地区：[1]广州科技贸易职业学院智能制造学院,广东广州511442 [2]鞍钢房产建设集团有限公司,辽宁鞍山114000 [3]广州金南磁性材料有限公司,广东广州511328 [4]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《钢铁钒钛》2024年第4期137-142,共6页Iron Steel Vanadium Titanium

基　　金：广州市教育局羊城学者科研专项(202235379);广东省教育厅特色创新科研专项(2021KTSCX273);广州市基础与应用基础研究专项(202201011608);广州市增城区创新领军团队专项(202102004)。

摘　　要：为了提高粉末注射成形技术制备的高氮无镍奥氏体不锈钢的性能,开展了后续固溶热处理。系统研究了固溶温度、固溶保温时间对不锈钢微观组织和力学性能的影响,并对固溶前后不锈钢样品的耐腐蚀性能进行了比较。结果显示:渗氮烧结后奥氏体基体中析出的Cr_(2)N第二相影响了不锈钢的力学和耐腐蚀性能。固溶处理后,烧结形成的Cr_(2)N第二相消失,为纯奥氏体组织。当固溶温度为1150℃,固溶保温时间为10 min时,不锈钢抗拉强度达到889 MPa,延伸率达到16.8%,力学性能最优。与固溶处理前相比,固溶处理后不锈钢样品腐蚀评级由0级提高到10级,耐腐蚀性能大幅提高。In this study,subsequent solution heat treatment was carried out in order to improve the properties of high nitrogen nickel-free austenitic(HNNFA)stainless steel prepared by MIM.The effects of solution temperature and duration on the microstructures and mechanical properties of HNNFA stainless steel were systematically studied.In addition,the corrosion resistances of stainless steel specimens before and after solution treatment were compared.The results show that Cr_(2N)precipitates in the austenitic matrix after sintering,thus affecting the mechanical and corrosion resistance of the HNNFA stainless steel.The secondary phase of Cr_(2N)disappears after solution heat treatment and the microstructure is composed of pure austenite.When the solution temperature is 1150℃and the holding time is 10 min,the HNNFA stainless steel has the best mechanical properties.Its tensile strength reaches 889 MPa and elongation reaches 16.8%.Compared with the specimens before solid solution treatment,the corrosion rating of HNNFA stainless steel after solution treatment is increased from 0 to 10,and the corrosion resistance is greatly improved.

关 键 词：高氮无镍不锈钢 粉末注射成形 固溶处理 氮化物 力学性能 耐腐蚀性能 

分 类 号：TF124[冶金工程—粉末冶金]