稀土Ce对32MnMoNiCu铸钢微观组织与力学性能的影响  

Effect of rare element Ce on microstructure and mechanical properties of 32MnMoNiCu cast steel

作　　者：李建国 贾冬生 赵银虎 刘玉宝[3] 王旭 赵磊城 兰岳光 Li Jianguo;Jia Dongsheng;Zhao Yinhu;Liu Yubao;Wang Xu;Zhao Leicheng;Lan Yueguang(Inner Mongolia First Machinery Group Co.,Ltd.,Baotou Inner Mongolia O14030,China;National Key Laboratory of Special Vehicle Design and Manufacturing Integration Technology,Baotou Inner Mongolia 014030,China;Baotou Research Institute of Rare Earths,Baotou Inner Mongolia 014020,China)

机构地区：[1]内蒙古第一机械集团股份有限公司,内蒙古包头014030 [2]特种车辆设计制造集成技术全国重点实验室,内蒙古包头014030 [3]包头稀土研究院,内蒙古包头014020

出　　处：《金属热处理》2025年第1期47-52,共6页Heat Treatment of Metals

基　　金：内蒙古自治区科技计划(2022YFSJ0035)。

摘　　要：通过在32MnMoNiCu铸钢中添加稀土铈铁合金,采用扫描电镜观察、拉伸和冲击性能测试等方法,研究稀土Ce对铸钢微观组织和力学性能的影响。结果表明:稀土Ce能够细化铸钢中铁素体组织,将长条状的夹杂物改变成球状,并且减小夹杂物尺寸;稀土Ce在钢中主要以CeAlO_(3)形式存在,与MnS夹杂物未发生反应;稀土Ce在32MnMoNiCu铸钢中通过析出强化和细晶强化的方式,使抗拉强度和屈服强度分别提高了12.3%和23.4%,但稀土Ce增加了板条状铁素体的比例,导致伸长率和冲击吸收能量分别降低了11.1%和7.4%。By adding rare earth cerium iron alloy in the 32MnMoNiCu cast steel,the effect of rare earth Ce on microstructure and mechanical properties of the cast steel was investigated by using scanning electron microscopy observation,tensile and impact testing methods.The results show that rare earth Ce can refine the ferrite phase,transform inclusions shape from long strip into nodular,and decrease the size of inclusions.Rare earth Ce mainly exists in the form of CeAlO_3,and does not react with MnS inclusions.Precipitation strengthening and fine-grained strengthening which are caused by rare earth Ce in the cast steel result in 12.3% and 23.4% increase in tensile strength and yield strength,respectively.However,the increase fraction of lath ferrite by adding rare earth Ce result in 11.1% and 7.4% decrease in elongation and impact absorbed energy,respectively.

关 键 词：32MnMoNiCu铸钢 稀土元素CE 微观组织 力学性能 

分 类 号：TG143.8[一般工业技术—材料科学与工程]