摘要
实验发现,纯铁经渗稀土处理后,其表层出现一细晶粒区域。将两种不同晶粒尺寸的20、20CrMnTi及45钢经相同稀土碳共渗工艺处理后还发现,原始晶粒细化既可增加渗层深度,又可改善渗层组织。本文以此为依据设计了稀土渗入时的晶界迁移模型,并探讨了稀土对晶界迁移及对碳原子扩散与析出机制的影响。
In the present investigation a layer with fine grains was found on the surface of pure iron after RE infiltration. It was also found that the refinement for original grains would lead to the increase in case depth and the improvement on carburizing microstructure after RE carburizing of steels of 20, 45 and 20CrMnTi in two different grain sizes. Based on above results a model of boundary migration was given and the effect of RE on the grain boundary migration, carbon atom diffusion and precipitation was discussed.
出处
《沈阳工业大学学报》
EI
CAS
1992年第3期22-27,共6页
Journal of Shenyang University of Technology
基金
中国科学院
沈阳金属研究所
材料疲劳与断裂全国开放实验室资助项目
关键词
晶粒间界
稀土元素
钢
表面
碳原子
rare earth series
grain boundary
migration
diffusion
