计云萍,亢磊,宋艳青,瞿伟,任慧平.RE2O3对钢液凝固时异质形核促进效用的晶体学计算[J].稀有金属材料与工程,2017,46(10):2889~2894.[Ji Yunping,Kang lei,Song Yanqing,Qu Wei,Ren Huiping.Crystallographic calculation about heterogeneous nucleation potency of RE2O3 in liquid steel[J].Rare Metal Materials and Engineering,2017,46(10):2889~2894.]
RE2O3对钢液凝固时异质形核促进效用的晶体学计算
投稿时间:2016-08-11  修订日期:2016-09-19
中文关键词:  RE2O3  钢液  异质形核  晶体学  边-边匹配模型
基金项目:国家自然科学基金项目(面上项目)
中文摘要:
      钢中微量稀土扩大凝固组织中等轴晶区比例、细化晶粒的作用受到研究者的高度重视,但是,对于高熔点的稀土夹杂物作为钢液凝固过程中异质形核核心的可能性及效用还有待从晶体学的角度开展深入的研究。本文针对钢中添加稀土镧、铈形成的高熔点夹杂物相Ce2O3和La2O3,利用边-边匹配模型计算其与初生相(δ-Fe或γ-Fe)之间的原子匹配情况,从晶体学角度预测其作为钢液凝固时初生相异质形核核心的可能性及效用,并为理解稀土细化钢的凝固组织的作用机理提供新的见解。结果表明,Ce2O3和La2O3均可作为初生相δ-Fe及γ-Fe异质形核的核心;Ce2O3和La2O3均可有效细化δ-Fe晶粒,但其细化γ-Fe晶粒的效果远不如其细化δ-Fe晶粒的效果;对于γ-Fe,La2O3的细化效果较Ce2O3稍好。
Crystallographic calculation about heterogeneous nucleation potency of RE2O3 in liquid steel
英文关键词:RE2O3  liquid steel  heterogeneous nucleation  crystallography  edge-to-edge matching model
英文摘要:
      It has been attracted increasing interest and attention of researchers and engineers that the trace rare lanthanum and cerium addition increased the proportion of the equiaxed grains and led to grain refinement in solidified microstructure of steels. Generally, it was considered that such grain refinement was attributed to the heterogeneous nucleation of the high-melting-point rare earth inclusions when the rare earth elements exist in the form of inclusions in steel. The inconsistent previously reported results drives the in-depth study of the grain refining efficiency of these inclusions for steel castings. In the present work, the edge-to-edge matching model was used to calculate the atomic matching between the RE inclusions, namely Ce2O3 and La2O3, and the primary phase (both δ-Fe and γ-Fe), in order to predict the possibility and the potency of RE2O3 acting as the heterogeneous nucleation sites in liquid steel and also provide fresh insight into the understanding of the grain refinement mechanism of rare earth in the solidification of steels from the point of view of crystallography. The results show that both Ce2O3 and La2O3 are potent nucleant for heterogeneous nucleation of both δ-Fe and γ-Fe primary phases during solidification of steels. But, the grain refining potency of Ce2O3 and La2O3 for δ-Fe is higher than that for γ-Fe. Moreover, for γ-Fe, the La2O3 is more efficient than Ce2O3.
作者单位E-mail
计云萍 内蒙古科技大学 材料与冶金学院 jiyunpingpp@163.com 
亢磊 内蒙古科技大学 材料与冶金学院  
宋艳青 内蒙古科技大学 材料与冶金学院  
瞿伟 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  
任慧平 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  
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