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.
出处
《热加工工艺》
CSCD
北大核心
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)
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
rare earth
low alloy wear-resistant cast steel
cast microstructure
dislocation
original austenite grain
