摘要
采用固体粉末渗硼法对45钢基体表面进行稀土催渗下的渗硼实验。通过金相和X射线衍射研究了渗硼后的物相组成和组织演变,讨论了渗硼过程中的硼化物形成动力学和稀土催渗硼机理。结果表明,45钢在稀土-硼共渗下可形成连续单一的Fe2B相硼化物;渗硼层组织致密,硼化物齿呈现直长而细密地垂直楔入基体的形貌特征,与基体牢固结合;稀土能对渗硼过程起到催渗作用,使渗硼速度加快,渗硼层厚度增加,但存在一个最佳稀土添加量,使渗硼催渗效果最好;稀土催渗作用是稀土对渗硼渗剂产生催化作用和对基体表面活化作用的综合结果;硼化物形成动力学符合抛物线规律,随渗硼时间延长,渗层厚度先快速增加,后缓慢增加。
The pack boronizing experiment under the condition of catalysis effects of rare earth（RE） elements was carded out on steel 45 surface with a method of solid powder boronizing. By means of OM and XRD, microstructure and phase composition of the steel 45 aiter boronizing were investigated. The boride formation kinetics and boriding mechanism on the RE-boronizing were discussed. The results show that the RE-boronized layer is consisted of continuous single phases Fe2B. Boronizing layer has compact structure. Boride teeth present straight long and vertically insertes matrix cause binding firmly between boronizing layer and matrix. Rare earth elements have catalysis effects on boronizing process of steel 45, lead to boriding more rapidly, have thicker boriding layer. But in order to obtain the best catalysis effects, there is the optimization of rare earth additives. The catalysis effect of rare earth is of the comprehensive action of rare earth catalysis to boriding powder and rare earth activation to the matrix surface. The formation kinetics of boronized layer follow with parabolic rule, and with boriding time increasing, boronized layer thickness increases rapidly at first, then increases slowly.
出处
《热加工工艺》
CSCD
北大核心
2013年第10期194-197,共4页
Hot Working Technology
基金
江西省自然科学基金资助项目(2010GQC0170)
南昌航空大学教改项目(JY1125)
江西省教育厅科技项目(GJJ11524)
关键词
固体粉末渗硼
稀土催渗
微观组织
solid powder boronizing
RE catalysis
microstructure
