热处理对接续金具用42CrMo4钢微观组织及力学性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of 42CrMo4 Steel Used for Continuous Fittings Manufacturing

作　　者：叶中飞 伍川 张博 刘泽辉 吕中宾 卢明 YE Zhongfei;WU Chuan;ZHANG Bo;LIU Zehui;LYU Zhongbin;LU Ming(Power Transmission Line Galloping Prevention and Control Technology Laboratory of State Grid,State Grid He'nan Electric Power Research Institute,Zhengzhou 450052,China)

机构地区：[1]国网河南省电力公司电力科学研究院输电线路舞动防治技术重点实验室,河南郑州450052

出　　处：《热加工工艺》2022年第6期117-120,125,共5页Hot Working Technology

基　　金：国家电网总部科技项目(5500-201924129A-0-0-00)。

摘　　要：采用热膨胀仪测量了42CrMo4钢的CCT曲线,确定了其奥氏体相变结束点为823.2℃,马氏体相变临界冷速为10℃/s;对水冷后的42CrMo4钢在570~720℃进行回火,利用组织观察与萃取析出相XRD分析的方法研究了回火温度对42CrMo4钢组织与力学性能的影响。结果表明,在570~660℃回火,42CrMo4钢析出相由M;C;和M;C组成,随回火温度提高M8C7含量逐渐降低,当回火温度超过690℃时析出相为M_(3)C。在570~720℃回火,随着回火温度的升高,42CrMo4钢的强度降低、韧性提高。The CCT curve of 42CrMo4 steel was measured by thermal dilatometer.It was determined that the end point of austenite transformation was 823.2℃and the critical cooling rate of martensite transformation was 10℃/s.After water-cooled,42CrMo4 steel was tempered at 570-720℃.The effects of tempering temperature on the microstructure and mechanical properties of 42CrMo4 steel were studied by means of microstructure observation and XRD analysis of extracted precipitates.The results show that the precipitates of 42CrMo4 steel is composed of M;C;and M;C when the tempering temperature is 570-660℃.The content of M;C;decreases gradually with the tempering temperature increasing.When the tempering temperature exceeds 690℃,the precipitates is M_(3)C.When tempered at 570-720℃,the strength of 42CrMo4 steel decreases and the toughness increases with the increase of tempering temperature.

关 键 词：42CrMo4 回火 析出相 

分 类 号：TG156.5[金属学及工艺—热处理] TG161[金属学及工艺—金属学]