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35 μin,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.
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