Ce对SUS434铁素体不锈钢凝固组织的影响  

Effect of Cerium on Solidification Structure of SUS434 Ferritic Stainless Steel

作　　者：张少华[1] 于彦冲[1,2] 李豪[1] 任祥[1] 王社斌[1,2] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]新材料界面科学与工程教育部重点实验室,山西太原030024

出　　处：《铸造技术》2016年第12期2641-2644,共4页Foundry Technology

基　　金：山西省科学基金资助项目(2015011068);太原理工大学校青年基金资助项目(2014TD014)

摘　　要：研究了稀土Ce对SUS434型铁素体不锈钢凝固组织的影响,结果表明:当稀土Ce含量在0.02%以下时,对其凝固组织的改善效果明显,并且随着稀土Ce添加量的增加,凝固组织中等轴晶的尺寸减小,比例增大,添加稀土Ce之后,铁素体不锈钢中形成了大量Ce_2O_3包裹着Si O_2的复合夹杂物,尺寸约为2μm,错配度计算表明,SUS434型铁素体不锈钢中铁素体基体的{110}面与Ce_2O_3的{1120}面之间的错配度仅为4.0%,所以,此夹杂物可以作为有效的非均质形核的核心,细化其凝固组织;当稀土Ce的添加量为0.03%时,形成了大尺寸的团聚态稀土复合夹杂物,无法改善其凝固组织。The influence of Ce on the solidification structure of SUS434 ferritic stainless steel was investigated. The results show that the improvement of the solidified structure is obvious when the content of rare earth Ce is 0 to 0.02%, and the proportion of its equiaxial crystal increase and its size decreases with the increase of adding amount of Ce. After adding rare earth Ce, the inclusions （Ce2O3 and SiO2） with a size of 2 μm form in the ferritic stainless steel. Based on the theory of lattice misfit, the lattice misfit between the index surface {110} of ferfite matrix and the index surface {1120} of Ce2O3 is only 4.0%, which is relatively low. As a result, the inclusions （Ce2O3 and SiO2） could serve as the core of heterogeneous nucleation and refine the solidification structure of the alloy. The reunion of large size of rare earth compound inclusions forms when the adding amount of rare earth Ce is 0.03%, which couldn＇t improve its solidified structure.

关 键 词：稀土Ce 凝固组织 铁素体不锈钢 错配度 

分 类 号：TG142.71[一般工业技术—材料科学与工程]