【摘要】 采用添加稀土化合物及优化工艺参数的方法解决了4Cr13不锈钢渗硼问题.通过正交试验法获得4Cr13钢渗硼工艺为:温度920℃,时间8h,最佳稀土加入量为0 5%(质量分数).借助于金相显微镜、X射线衍射仪及显微硬度计,观察和分析了加稀土前后渗层的组织、表面和次表面的相结构以及渗层的显微硬度分布.结果表明:加稀土元素后,渗层厚度提高,硼化物的组织形态及致密度明显改善,表面获得以Fe2B、(Fe,Cr)2B为主的组织,渗层脆性降低.更多还原

【Abstract】 This paper solves the boronizing problem of 4Cr13 stainless steel by adding RE compound and optimizing the process parametersIt is concluded that optimization process parameters are 920 ℃×8 h and value of RE is 05%wt by the orthogonal testsThe microstructure and phases of the surface and subsurface and microhardness of boronizing layer are analysed and observed by means of the optical microscope, xray and microhardness testerThe results show that after adding RE,the depth of boronizing layer increases and the morphology,microstructure and brittleness of boride are improved greatly,the main phases on the surface of boronizing layer are Fe2B,(Fe,Cr)2B更多还原