低碳合金齿轮钢渗碳淬火质量的EPMA评价  

EPMA Evaluation of Carburizing and Quenching Quality of Low-carbon Alloy Gear Steel

作　　者：王元栋 张晓菊 何亮亮 海侠女 桂伟民 WANG Yuan-dong;ZHANG Xiao-ju;HE Liang-liang;HAI Xia-nv;GUI Wei-min(Shaanxi Fast Auto Drive Group Co.,Ltd.,Xi'an Shaanxi 710119,China)

机构地区：[1]陕西法士特汽车传动集团有限责任公司,陕西西安710119

出　　处：《热处理技术与装备》2022年第5期57-62,共6页Heat Treatment Technology and Equipment

基　　金：陕西省重点研发计划(2021GY-256)。

摘　　要：以一组低碳合金标准样品为研究对象,探索出了一种利用电子探针准确测定碳含量的方法。对Mn-Cr系和Cr-Ni-Mo系低碳合金齿轮钢进行渗碳淬火,使其表面获得渗碳层,以EPMA-1720型电子探针校准曲线法,建立测定碳含量的工作曲线;然后利用EPMA对渗碳层碳含量、渗碳层深度、碳含量分布等进行测定。并将实际检测结果与直读光谱仪法、显微硬度法以及金相法进行比较,对于不同的材料,显微硬度法并不能完全显示出整个渗碳层中碳元素的分布情况,而电子探针法可以准确测定整个渗层碳元素的含量及分布,可有效指导热处理工艺的调整。在相同渗碳工艺条件下,渗碳件的渗碳层深与材料的淬透性有关,硬度梯度不一定能准确反应真实的碳元素分布情况。Taking a group of low carbon alloy standard samples as research object, a method for accurately determining the carbon content by electron probe microanalysis was explored. The Mn-Cr series and Cr-Ni-Mo series low carbon alloy steel gear parts were carburized and quenched to obtain carburized layer on the surface. The working curve for measuring carbon content was established by EPMA-1720 electron probe calibration curve method. Then the carbon content, depth and carbon content distribution of carburized layer were measured by EPMA. The actual detection results were compared with the direct reading spectrometer method, microhardness method and metallographic method, it was found that for different materials, the microhardness method could not fully display the distribution of carbon elements in the whole carburized layer, while the electron probe method could accurately determine the content and distribution of carbon elements in the whole carburized layer, which could effectively guide the adjustment of heat treatment process. Under the same carburizing process, the carburized layer depth of the carburized parts was related to the hardenability of the material, and the hardness gradient might not accurately reflect the real distribution of carbon elements.

关 键 词：低碳合金齿轮钢 渗碳淬火 EPMA 

分 类 号：TG162.73[金属学及工艺—热处理]