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本文是在热力学分析的基础上,对气体碳氮硼三元共渗这一新的化学热处理工艺的试验研究结果。研究中曾试验和观察了20钢经三元共渗后的耐磨性、残余应力和残余奥氏体等。我们认为,硼在渗层中主要溶解于奥氏体和马氏体中,并具有良好的分布状态。这就使得渗层能获得固溶强化效果,存在着比碳氮共渗更高的残余应力和较高的疲劳强度。渗层中残余奥氏体量较多,残余奥氏体与残余应力的分布趋势一致,对改善另件性能是有益的。这一工艺已应用在钢领和自行车另件上,并取得了显著成就。总之,三元共渗是一种很有发展前途的表面强化枝术,它很少引起缺陷,特别适用于要求高硬度、高耐磨性和疲劳强度的另件。
In this paper, based on the thermodynamic analysis, the experimental results of the new chemical heat treatment process of gas carbonitriding boron ternary infiltration are presented. In the study, we have tested and observed the wear resistance, residual stress and residual austenite of 20 steel after ternary infiltration. In our opinion, boron mainly dissolves in austenite and martensite in the diffusion layer and has a good distribution. This makes the diffusion layer can obtain solid solution strengthening effect, there is higher than the carbonitriding residual stress and high fatigue strength. There are many residual austenite in the infiltration layer, and the distribution trend of residual austenite and residual stress is consistent, which is beneficial to improve the performance of the other components. This process has been applied to the other parts of the ring and bicycle, and has made remarkable achievements. In summary, ternary permeation is a very promising surface strengthening technique that rarely causes defects and is particularly suitable for applications requiring high hardness, high wear resistance and fatigue strength.