钎具钢23CrNi3Mo渗碳规律及显微组织研究  

Carburizing law and microstructure of 23CrNi3Mo drill steel

作　　者：闫永明[1] 刘雅政[1] 周乐育[1] 徐盛[1] 王国存[2] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]西宁特殊钢股份有限公司,西宁810005

出　　处：《材料科学与工艺》2013年第5期102-108,共7页Materials Science and Technology

摘　　要：采用固态渗碳法，从碳浓度分布、表面碳含量、渗碳层深度和显微组织等方面着手，研究了不同渗碳温度和渗碳时间下23CrNi3Mo钢的渗碳规律及显微组织状态．结果表明，23CrNi3Mo渗碳过程中，渗碳温度选择910-930℃时表面碳浓度较高，利于渗碳过程中碳原子由表面向心部的扩散．在渗碳过程中，表面碳浓度应控制在0．80％～0．90％，碳浓度≥0．90％时，在淬火过程中易出现残余奥氏体，表面硬度下降，降低钎具的使用寿命．By solid carburizing, the carburizing law and microstructure of the 23CrNi3Mo steel was studied from the varying pattern of carbon concentration gradient, surface carbon content, carburizing layer depth and microstructure at different temperature and times. The result showed that, when the carburizing temperature was between 910 - 930 ℃, the surface carbon concentration was higher, which was better for the proliferation of carbon atoms from the surface to the center. During the carburizing process, the surface carbon concentration should be controlled between 0. 80% - 0. 90% , and when it was equal or over 0. 90% , the remained austenite would be easily found during quenching process and the surface hardness would be decreased and the working life of drilling tools would be shortened.

关 键 词：23CrNi3Mo 固态渗碳 渗碳层深度 渗碳温度 渗碳时间 残余奥氏体 

分 类 号：TG142.1[一般工业技术—材料科学与工程]