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为进一步提高渗层厚度及渗层性能,对45钢进行离子氮碳共渗与离子渗氮复合处理。采用扫描电镜、X射线衍射仪、显微硬度计和光学显微镜对渗层厚度、物相组成、截面与表面硬度、渗层脆性进行了分析。结果表明,复合处理可使45钢获得比单一离子渗氮或离子氮碳共渗更快的渗速、更优的性能。相同的处理时间下,复合处理渗层厚度比单一离子渗氮或离子氮碳共渗大幅度增加,有效硬化层比单一离子渗氮增加约35μm,提高约1倍,同时渗层脆性显著降低。物相分析表明复合处理后化合物层中ε相和γ’相的相对含量发生了变化,即ε相增多,而γ′相减少。
In order to further improve the thickness of the infiltration layer and the performance of the infiltration layer, the 45 steel was subjected to ion nitrocarburizing and ion nitriding composite treatment. The thickness, phase composition, cross section, surface hardness and brittleness of the layer were analyzed by scanning electron microscopy, X-ray diffraction, microhardness tester and optical microscope. The results show that the composite treatment can make 45 steel faster than the single ion nitriding or ion nitrocarburising speed, better performance. Under the same treatment time, the thickness of the composite layer increases greatly compared with that of the single ion nitriding or ion nitrocarburizing. The effective hardening layer increases by about 35 μm and about one time as compared with the single ion nitriding, and the brittleness of the layer decreases significantly. The phase analysis showed that the relative content of ε phase and γ ’phase in the compound layer changed after compound treatment, that is, the ε phase increased while the γ’ phase decreased.