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对55Si Cr弹簧钢表面进行不同强度的喷丸处理,并在390℃进行低温气体渗氮12 h。利用超景深显微镜、显微硬度计、直读光谱仪以及X射线衍射仪(XRD)分析了渗氮层的显微组织、厚度、氮含量和相组成。结果表明,渗氮层主要由γ’-Fe4N和αN相组成,并有少量的Cr N和Fe3O4。随喷丸强度增加,渗氮层组织更加均匀致密,渗氮层厚度、表面硬度和渗层氮含量均增加。
The surface of 55Si Cr spring steel was shot peening with different intensities and gas nitriding was carried out at 390 ℃ for 12 h. The microstructure, thickness, nitrogen content and phase composition of the nitrided layer were analyzed by using the depth of field microscope, microhardness tester, direct reading spectrometer and X-ray diffraction (XRD). The results show that the nitrided layer mainly consists of γ’-Fe4N and αN phases with a small amount of Cr N and Fe3O4. With the increase of shot peening strength, the microstructure of nitrided layer is more uniform and compact, and the nitrided layer thickness, surface hardness and nitrided layer content increase.