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采用喷丸技术作为催渗方法促进渗氮,将经不同喷丸强度处理的55SiCr弹簧钢试样分别在370℃和390℃进行低温渗氮处理12 h,通过金相显微镜、X射线衍射仪和HV-50Z显微硬度仪,对渗层的显微组织、硬度进行分析对比。结果表明:渗氮后弹簧表面硬度提高20%左右,随喷丸强度的提高渗氮层厚度不断加深,最低喷丸强度弹簧试样和最高喷丸强度弹簧试样其渗氮层厚度相差20μm以上。
The shot peening technique was used as a method of promoting nitriding. 55SiCr spring steel specimens treated with different shot peening strength were nitrocarburized at 370 ℃ and 390 ℃ for 12 h, respectively. The microstructure of the specimens was characterized by means of metallographic microscope, X-ray diffraction HV-50Z microhardness tester, the microstructure of the layer, hardness analysis and comparison. The results show that the surface hardness of the spring increases about 20% after nitriding. The thickness of nitrided layer deepens with the increase of shot peening strength. The difference of the nitrided layer thickness between the lowest shot peening spring specimen and the highest shot peening spring specimen is more than 20 μm .