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将QPQ技术应用于65Mn钢,用SEM、显微硬度计和摩擦磨损试验机分别对QPQ渗层的显微组织、显微硬度和耐磨性进行分析研究,与调质态试样和盐浴渗氮试样进行对比试验;为了优选典型的渗氮温度、渗氮时间、氧化温度和氧化时间,设计了一组正交试验,以平均摩擦因数和磨损量为依据分析了QPQ工艺中4种工艺参数对其耐磨性的影响。结果表明,QPQ渗层表面平整,渗层由外到内依次为氧化膜、疏松层、化合物层和扩散层;QPQ处理试样的最高硬度为710 HV0.1,基体硬度为360 HV0.1;其最小磨损量的最优工艺参数为渗氮温度570℃,渗氮时间3 h,氧化温度330℃,氧化时间40 min。优化工艺处理的试样其摩擦因数为0.077,为调质态试样的60.5%,磨损量为2.1 mg,仅为调质态试样的18.8%。
The QPQ technology was applied to 65Mn steel, the microstructure, microhardness and wear resistance of QPQ layer were analyzed by SEM, microhardness tester and friction and wear tester, respectively. In order to optimize the typical nitriding temperature, nitriding time, oxidation temperature and oxidation time, a series of orthogonal experiments were designed. Based on the average friction coefficient and the wear amount, four kinds of QPQ processes Effect of process parameters on its wear resistance. The results show that the surface of QPQ layer is smooth and the outer layer of oxide layer, loose layer, compound layer and diffusion layer are from outer to inner layer. The maximum hardness of QPQ is 710 HV0.1 and the matrix hardness is 360 HV0.1. The minimum wear amount of the optimum parameters for the nitriding temperature 570 ℃, nitriding time 3 h, oxidation temperature 330 ℃, oxidation time 40 min. The friction coefficient of the sample treated by the optimized process was 0.077, which was 60.5% of the quenched and tempered sample, and the wear amount was 2.1 mg, which was only 18.8% of that of the quenched and tempered sample.