针对农用20CrMnMo链条轴渗碳淬火疲劳寿命低的工程应用现状,本文通过对20CrMnMo进行调质、淬火、淬火+低温回火不同预先热处理,然后进行低温气体渗氮,探讨提高链轴抗疲劳寿命热处理工艺.通过金相、显微硬度仪、扫描电镜、电子探针对渗层组织和成分进行了分析;采用摩擦磨损试验机、链条台架实验机,三维形貌仪对链轴的耐磨、抗疲劳性能进行了评价.结果表明:经过调质预处理的试样能够得到均匀、致密的渗层组织,渗层深度500 μm,渗层硬度梯度平缓,其耐磨性能优于碳氮共渗的链轴.
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