摘要
本文研究了稀土对气体碳氮共渗动力学过程、渗层成分和组织结构、渗层性能的响。通过优化选择了合适的稀土种类，加入量和工艺参数。结果表明，稀土具有明显的催渗作用，与不加稀土相比，可使渗速提高３０％；表层中碳、氮含量增加，碳化物的数量增加、颗粒变得细小、弥散且向内延伸分布。马氏体和残余奥氏体细化；渗层硬度提高，显微硬度分布趋于合理；在高负荷下渗层的耐磨性提高约３０％，经该技术处理的饲料压模的寿命大幅度提高。电子能谱分析和物相分析表明，稀土元素渗入渗层并形成稀土化合物相，起到微合金化作用。
The effects of rare earth (RE) on the gas carbonitriding rinetics . concentra- tion , microstrtuctures and properties of carbonitrided case were studied. The suitable RE - compound . optimum addition of RE and technological parameters were chosen. The experi- mental results showed that the energizing effect of adding RE on carbontriding is remarkable. Because of adding RE , the contents of C and N and the quantity of carbide particls are in- creased . the microstructures are refined and the machanic properties of specimen are increased . The service life of ring - die by RE - carbonitriding is longer than that by conventional pro cessi It also showed that Ce permeated into the surface case and formed ally carbide by X - ray diffractmeter and Auger electron spectrocope
出处
《郑州工业大学学报》
1997年第2期42-46,共5页
Journal of Zhengzhou University of Technology
