轴承钢低温离子渗硫层的微观组织分析

对经过表面碳氮共渗和低温离子渗硫处理的轴承钢显微组织进行了观察和分析，并将其与单一碳氮共渗试样、原始淬火态试样的微观组织进行对比。该研究以较低温度对轴承钢进行离子渗硫处理，可以避免轴承钢回火软化，且固体硫粉作为硫源有效降低了对环境的污染，在渗硫工艺方面进行了有益的探索。试验结果表明：碳氮共渗和低温渗硫处理后GCr15轴承钢表面形成了复合渗硫层，其微观形貌呈现凹凸不平的颗粒状，经过处理后表面洛氏硬度略有下降；能谱仪测试结果表明渗硫层的成分主要由Fe、S、O等元素组成。

Microstructure analysis of low temperature ion sulfurized layer of bearing steel

The microstructures of bearing steel treated with surface carbonitriding and low temperature ion sulphurizing were observed and analyzed, and were compared with the microstructures of single carbonitriding samples and original quenched samples. In this study, ion sulfurizing treatment of bearing steel at a lower temperature can avoid tempering softening of bearing steel, the solid sulfur powder as sulfur source can effectively reduce the pollution to the environment, and a beneficial exploration has been carried out in the sulfurizing process. The test results show that after carbonitriding and low-temperature sulphurization, a composite sulphurized layer forms on the surface of GCr15 bearing steel, and its micro-morphology is uneven and granular. After treatment, the Rockwell hardness of the surface decreases slightly. The energy spectrum results show that the composition of the sulphurized layer is mainly composed of Fe, S, O and other elements.