时效处理对Cr20Mn18N0.5高氮奥氏体不锈钢组织与力学性能的影响  

Effects of Aging Treatment on Microstructure and Mechanical Properties of Cr20Mn18N0.5 High Nitrogen Austenitic Stainless Steel

作　　者：赵兰英[1] 陈家兴 ZHAO Lanying;CHEN Jiaxing(School of Civil Engineering,Shangqiu Institute of Technology,Shangqiu 476000,China;School of Civil Engineering,North China University of Water Conservancy and Electric Power,Zhengzhou 450000,China)

机构地区：[1]商丘工学院土木工程学院,河南商丘476000 [2]华北水利水电大学土木工程学院,河南郑州450000

出　　处：《热加工工艺》2020年第22期132-134,共3页Hot Working Technology

基　　金：河南省科技攻关项目(192102310510)。

摘　　要：采用显微组织观察、拉伸试验等方法研究了不同时效处理对Cr20Mn18N0.5高氮奥氏体不锈钢组织及力学性能的影响。结果表明:随着时效温度的增加,试验钢中Cr2N析出相先增加后减少,700℃时效的试验钢中Cr2N析出相数量最多。随着时效时间的延长,试验钢中Cr2N析出相逐渐增加。700℃×12 h时效试验钢,析出物开始向晶粒内部生长,抗拉强度和伸长率分别为823 MPa和52.7%,与固溶态相比,分别下降了4.1%和8.3%。The effects of different aging treatments on the microstructure and mechanical properties of Cr20Mn18N0.5 high nitrogen austenitic stainless steel were studied by means of microstructure observation and tensile test. The results show that with the increases of aging temperature, the number of Cr2N precipitates increases first and then decreases, and the number of Cr2N precipitates in the test steel aged at 700 ℃ reaches the maximum. With the increases of aging time, the precipitation of Cr2N in test steel increases gradually. The precipitates in the test steel aged at 700 ℃×12 h begin to grow into the grains. The tensile strength and elongation of the test steel are 823 MPa and 52.7%, respectively, which are 4.1% and 8.3%lower than that of the solid solution test steel.

关 键 词：高氮奥氏体不锈钢 时效 析出相 力学性能 

分 类 号：TG161[金属学及工艺—热处理]