摘要
为了消除08钢制滚针轴承保持架气体软氮化（ANCT）后存在组织分布不均匀、性能达不到要求等缺陷，在前期奥氏体区软氮化工艺试验的基础上，选择180—300℃回火温度进行回火处理。通过金相显微组织观察和显微硬度检测，分析回火工艺对工件显微组织和显微硬度的影响规律，获得最佳热处理工艺为：ANCT三区温度为850℃→750℃→620℃，氨气流量为18．5L／min，乙醇滴量为5mL／min，油淬，250—300℃回火，水冷。经此处理后，白亮层和马氏体层的平均厚度分别为8μm和26．3μm，心部晶粒组织的平均尺寸为6．3μm，达到提高表面耐磨性的要求。
In order to eliminate the defects of needle roller bearing cage after gas soft nitriding, tempering is performed at 180 - 300 ℃, based on early experiments of austenitic area soft nitriding. With the aids of microstructure observation and micro - hardness measurement, the influence of tempering process on the microstructure and micro - hardness is analyzed. The optimal heat treatment processes are as follows ： the ANCT temperature in the three areas is 850℃, 750 ℃ and 620℃, ammonia flow is 18.5 L/rain, ethanol drop is 5 mL/min, oil quenching and tempering at 250-300 ℃, water - cooled. After the treatment, the average thickness of the white layer and martensite layer are 8 μm and 26.3 μm respectively, the average size of core grains is 6.3 μm, meeting the demand of the surface wear resistance.
出处
《轴承》
北大核心
2008年第1期13-16,共4页
Bearing
基金
福建省教育厅重点资助项目(JA04251)
福建省科技厅重大专项(2006HZ0002-1)
关键词
滚针轴承
保持架
回火
氮碳共渗
显微组织
显微硬度
needle roller bearing
cage
temper
nitrocarburized
microstructure
microhardness
