含碳量对氮化件白亮层厚度的影响
The Effect of Carbon Content on the Thickness of Compound Layer after Nitriding

本文主要研究在锻件毛坯表面存在一定深度脱碳，而后续机加工未完全去除表面脱碳层的情况下对热处理氮化后零件的白亮层厚度是否产生影响。为了得到充分的数据支撑，采取了正、反向实验验证；对不同材料的零件进行不同程度的渗碳和对其中一种材料的零件进行高温脱碳，最后用相同热处理工艺进炉氮化，对比不同状态下白亮层的厚度。从结果看，表面碳势高的零件氮化后比未渗碳的零件白亮层要明显厚一些；脱碳的零件比未脱碳的零件氮化后白亮层要浅一些。以上的结论对控制热处理氮化后白亮层厚度的稳定性有一定现实的指导意义。
This paper mainly studies the effect on the compound layer thickness of the parts after nitriding. And for these parts, there is a certain depth of decarbonization layer on the surface after forging, and the subsequent machining has not completely removed the surface decarbonization layer. In order to obtain sufficient data, forward and reverse experiments were carried out, such as different degrees of carburizing for the parts of different materials, high temperature decarbonization of the parts chosen from one of the materials, and comparing the thickness of the compound layer under different states which were nitrided with the same heat treatment program. The results show that the compound layer of the parts with high surface carbon potential is significantly thicker than that of the parts without car-burizing. And the compound layer thickness of the decarbonized parts is thinner than that of non-decarbonized parts after nitriding. The conclusions above have a certain guidance to keep the stability of the compound layer thickness after nitriding.