稀土Ce对铸造Cr30Mo2超级铁素体不锈钢组织与力学性能的影响  

Effects of Cerium Addition on Solidification Structure and Mechanical Properties of Cr30Mo2 Super Ferritic Stainless Steel

作　　者：段超辉 宁礼奎[1] 祝洋洋 谭政[1] 刘恩泽[1] 佟健[1] 李海英 王增睿 郑志[1] Duan Chaohui;Ning Likui;Zhu Yangyang;Tan Zheng;Liu Enze;Tong Jian;Li Haiying;Wang Zengrui;Zheng Zhi(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Shenyang Foundry Research Institute Co.,Ltd,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [3]沈阳铸造研究所有限公司,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2021年第9期3288-3294,共7页Rare Metal Materials and Engineering

基　　金：辽宁省科技攻关计划课题(2019JH2/10100009)。

摘　　要：研究了不同Ce含量对铸造Cr30Mo2超级铁素体不锈钢组织与力学性能的影响。结果表明,Cr30Mo2超级铁素体不锈钢中夹杂类型主要为富Cr氧化物和Al-Si复合氧化物,且形状不规则,加入Ce后转变为Ce_(2)O_(3)和心部富Al、Si,外层富Al、Ce的圆球状复合夹杂,尺寸较小,形状圆润,夹杂含量显著降低;Ce_(2)O_(3)可以作为异质形核核心,增加铸件形核率,减小晶粒尺寸,但Ce含量过高,晶粒尺寸反常增大;Ce可显著改善Cr30Mo2超级铁素体不锈钢的室温塑性,添加质量分数0.07%Ce能将Cr30Mo2超级铁素体不锈钢铸件的断后延伸率由1.5%提高至20%左右。The effect of different Ce contents on the microstructure and mechanical properties of Cr30Mo2 super ferrite stainless steel was studied.The results show that the types of inclusion in the Cr30Mo2 super ferrite stainless steel are mainly Cr-rich oxides and Al-Si composite oxides with irregular shapes,which are converted into Ce_(2)O_(3) after Ce addition and spherical composite inclusions rich in Al and Si in the core and Al and Ce in the outer layer,with small size,round shape and the significantly reduced inclusion content.Ce_(2)O_(3) can be used as heterogeneous nucleation core,which can increase casting nucleation rate and reduce grain size.However,excessive Ce content results in abnormal increase of grain size.Trace Ce can significantly improve the plasticity of Cr30Mo2 stainless steel at room temperature.Adding 0.07wt%Ce can increase the elongation after fracture of Cr30Mo2 super ferritic stainless steel castings from 1.5%to about 20%.

关 键 词：Cr30Mo2超级铁素体不锈钢 铸造 CE 晶粒尺寸 氧化物夹杂 力学性能 

分 类 号：TG142.23[一般工业技术—材料科学与工程]