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以42CrMo钢为材料,通过在离子氮碳共渗过程中添加空气进行离子氮碳氧多元共渗。采用扫描电镜、光学显微镜、X射线衍射仪和显微硬度计对渗层形貌、渗层厚度、渗层物相和截面硬度进行分析。研究结果表明,在传统离子氮碳共渗过程中添加适量的空气具有显著的催渗效果,且以空气流量为0.3 L/min的效果最佳,截面硬度也得到大幅度提高。离子氮碳氧多元共渗中氮原子的扩散激活能从传统离子氮碳共渗的56.12 k J/mol降低到25.27 k J/mol。同时,对离子氮碳氧多元共渗的机理进行了分析。
Using 42CrMo steel as material, ion nitrocarburizing was carried out by adding air during ion nitrocarburizing. The morphology of the layer, the thickness of the layer, the phase of the layer and the hardness of the section were analyzed by SEM, optical microscope, X-ray diffraction and microhardness tester. The results show that adding proper amount of air during conventional ion nitrocarburizing has a significant effect of catalysis, and the air flow rate of 0.3 L / min is the best, and the cross-section hardness is greatly improved. The diffusion activation energy of nitrogen atoms in ion nitrocarburizing was decreased from 56.12 kJ / mol to 25.27 kJ / mol in conventional nitrocarburizing. At the same time, the mechanism of ion nitrocarburizing is discussed.