热处理工艺对42CrMo-R钢轮箍组织及力学性能的影响  

Effect of heat treatment process on microstructure and mechanical properties of 42CrMo-R steel tyre

作　　者：万志健 安涛[1,2,4] 于文坛 刘学华 童乐[1,2,3] 赵海 Wan Zhijian;An Taol;Yu Wentan;Liu Xuehua;Tong Le;Zhao Hai(National-Local Joint Engineering Research Center of Advanced Manufacturing Technology for Key Parts of Rail Transit,Ma'anshan Anhui 243003,China;Key Parts of Rail Transit Technology Innovation Center of Anhui Province,Ma'anshan Anhui 243003,China;Maanshan Iron&Steel Co.,Ltd.,Ma'anshan Anhui 243003,China;Baowu Group Masteel Rail Transit Materials Technology Co.,Ltd.,Ma'anshan Anhui 243000,China)

机构地区：[1]轨道交通关键零部件先进制造技术国家地方联合工程中心,安徽马鞍山243003 [2]轨道交通关键零部件安徽省技术创新中心,安徽马鞍山243003 [3]马鞍山钢铁股份有限公司,安徽马鞍山243003 [4]宝武集团马钢轨交材料科技有限公司,安徽马鞍山243000

出　　处：《金属热处理》2024年第9期158-164,共7页Heat Treatment of Metals

基　　金：安徽省科技重大专项(202003a05020038)。

摘　　要：设计并冶炼了42CrMo-R试验钢,并轧成轮箍。采用金相显微镜、扫描电镜及拉伸试验机、硬度计等手段研究了热处理工艺对42CrMo-R钢轮箍组织及力学性能的影响。结果表明,42CrMo-R钢轮箍在830~980℃范围内淬火后,组织基体均为板条马氏体,当淬火温度超过890℃,板条马氏体占比显著增多;860℃淬火时,原奥氏体晶粒尺寸分布均匀并且强度最高,为最佳淬火温度。在520~600℃范围内回火,轮箍基体组织均为回火索氏体;随着回火温度的升高,硬度、抗拉强度、屈服强度均呈下降趋势,而断后伸长率、断面收缩率则基本呈上升趋势。42CrMo-R钢轮箍经860℃淬火及560~580℃回火后,回火索氏体占比较高,存在少量未溶铁素体,R_(m)、R_(p0.2)、硬度、断后伸长率与客户要求相比均有较大富余量,具有良好的组织及综合力学性能。42CrMo-R test steel was designed and smelted and rolled into a tyre.Effect of heat treatment process on microstructure and mechanical properties of the 42CrMo-R steel tyre were studied by means of metallographic microscope,scanning electron microscope,tensile testing machine,hardness tester and other methods.The results show that after quenching in the range of 830-980℃,the matrix of the 42CrMo-R steel tyre is lath martensite,when the quenching temperature exceeds 890℃,the proportion of lath martensite increases significantly,and when quenched at 860℃,the original austenite grain size distribution is uniform and the strength is the highest,so it is the optimal quenching temperature.Tempered in the range of 520-600℃,the tyre matrix microstructure are all tempered martensite.With the increase of tempering temperature,the hardness,tensile strength and yield strength all show a downward trend,while the elongation and percentage reducation of area basically show an upward trend.Affer quenching at 860 C and tempering at 560-580℃,the 42CrMo-R steel tyre has a relatively high proportion of tempered martensite,a small amount of undsslved ferite and there is a large margin of R_(m),R_(P0.2),hardness and elongation compared with customer requirements,and it has good microstructure and comprehensive mechanical properties.

关 键 词：热处理 42CrMo-R钢 轮箍 组织 力学性能 

分 类 号：TG142.3[一般工业技术—材料科学与工程]