稀土对低合金耐磨铸钢铸态显微组织的影响  

Influence of Rare Earth on Cast Microstructure of Low Alloy Wear-resistant Cast Steel

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

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]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：《热加工工艺》2014年第9期21-24,共4页Hot Working Technology

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

摘　　要：针对未添加稀土和添加不同量La、Ce稀土的低合金耐磨铸钢铸态试样,采用金相显微镜、QUANTA-400环境扫描电镜和JEM-2100透射电镜对其铸态组织、微观亚结构及原始奥氏体晶粒大小进行观察分析,探讨稀土的作用机理。结果表明,未添加稀土时,试验钢的铸态组织为粒状贝氏体,当La、Ce稀土总量为0.0092%时,有少量下贝氏体出现,随稀土含量增加到0.0320%,下贝氏体量增多,并且有板条马氏体出现;透射电镜观察表明,添加稀土可以增大铸态组织中的位错密度、细化试验钢的原始奥氏体晶粒,并使晶粒也更加均匀。The cast microstructure, sub-microstructure and original austenite grain size of low alloy wear-resistant cast steel with and without different proportion rare earth La and Ce were observed by metallographic microscope, QUANTA-400 environmental scanning electron microscope （SEM） and JEM-2100 transmission electron microscope （TEM）, and the effect mechanism of the rare earth on the microstructure was investigated. The results show that, the cast microstructure of low alloy wear-resistant cast steel without adding rare earth is granular bainite, when adding rare earth 0.0092%, the cast microstructure has little lower bainite, with the amount of rare earth increasing to 0.0320%, there is more lower bainite, and any lath martensite is found. From TEM images, rare earth can increase the dislocation density; in addition, rare earth can reduce the original austenite grains size, and which can cause the original austenite grain to become more uniform.

关 键 词：稀土 低合金耐磨铸钢 铸态组织 位错 原始奥氏体晶粒 

分 类 号：TG142.72[一般工业技术—材料科学与工程]