40CrMnMo活塞连杆稀土离子氮碳共渗工艺

RE-nitrocarburizing Technology for Piston Rod Made of 40CrMnMo

对40CrMnMo钢制活塞连杆试样进行不同温度、时间、气压及稀土含量下的稀土离子氮碳共渗工艺试验,测定了不同工艺参数下表面强化层的硬度、厚度,并对比了稀土离子氮碳共渗工艺与其他表面强化工艺处理后的磨损性能和弯曲疲劳强度等力学性能。结果表明:5%RE、520℃×2h、1.05kPa气压为该工艺的最佳参数。40CrMnMo钢制高速增压柴油机活塞连杆用该工艺处理后,完全能满足其使用性能要求。

Some ion RE-nitrocarbnrizing tests were carried out on the 40CrMnMo steel piston rod with different temperature, time, gas pressure and RE content. The surface micro-hardness and the depth of strengthened layers were determined and the wear resistance and bending fatigue strength were compared with other surface treatments. The results show that the optimum parameters are of that the RE content is 5wt%, the treating temperature, time and gas pressure are 520℃, 2 h and 1.05 kPa, respectively. The 40CrMnMo steel piston rod treated with this technology can completely meet the quality requirement used in high speed supercharge diesel engine.