添加稀土的20MnCrNi2Mo耐磨铸钢静态CCT曲线的研究  

Study on Static CCT Curve of 20MnCrNi2Mo Wear-resistant Cast Steel with Rare Earth

作　　者：计云萍[1,2] 任慧平[1,2,3] 刘新华[1,3] 侯敬超[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]上海大学材料科学与工程学院,上海200072 [3]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《稀土》2014年第6期7-12,共6页Chinese Rare Earths

基　　金：国家自然科学基金项目(51261018);内蒙古自然科学基金项目(2012MS0805);内蒙古科技大学创新基金项目(2011NCL037)

摘　　要：以添加La、Ce混合稀土的20MnCrNi2Mo耐磨铸钢为研究对象,采用德国产的L78 RITA淬火热膨胀仪,结合金相观察与硬度分析,测定了其静态CCT曲线,根据测得的CCT曲线,分析并阐明了冷却速度与组织演变、硬度变化的关系。结果表明,试验钢的静态CCT曲线只有贝氏体转变区和马氏体转变区,且贝氏体转变区延伸的范围较宽,其临界冷却速度为4℃/s,淬透性较好,这主要取决于合金元素与固溶稀土的综合作用。研究结果既能够为稀土在耐磨铸钢中应用的理论研究提供有用的实验数据,又能够为生产实践提供参考依据。The static CCT curve of 20MnCrNi2Mo wear-resistant cast steel adding rare earth elements of La and Ce was measured by L78 RITA quenching thermal dilatometer combined with metallographic observation and hardness analysis. According to the CCT curve,the relations between the cooling velocity and the evolution of microstructure and the hardness were analyzed. The results show that the CCT curve only includes bainite transformation area,and martensite transformation area,and the bainite transformation area extends to a wider time range. The critical cooling velocity is 4 ℃/s,showing good hardenability. It mainly depends on the integrated effect of the alloy elements and the solid-solution rare earth in steel. The results can provide helpful experimental data for the theoretical research of rare earth application in wear-resistant cast steel,and also offer the references for the actual production.

关 键 词：稀土 20MnCrNi2Mo耐磨铸钢 CCT曲线 临界冷却速度 淬火热膨胀仪 

分 类 号：TG113.12[金属学及工艺—物理冶金]