渗碳层厚度及碳含量的表征方法

Characterization method of case depth and carbon concentration

为了衡量渗碳工艺是否合适,需要对渗碳层的厚度及碳含量进行准确测定。实验探索了一种能够快速准确地表征渗碳层厚度及碳含量的方法,并以18CrNiMo7-6钢为例进行了相关测定。首先,利用化学法验证了电子探针法测定渗碳层的准确性。其次,对比了电子探针法与硬度法的结果,两种方法测定渗碳层厚度的结果一致,电子探针法同时给出了不同渗碳层厚度与碳含量的变化曲线。再次,利用金相法观察了渗碳层及基体的微观组织,由于渗碳层厚度超过了金相法的测定范围,无法做出结果对比。综上所述,电子探针法既可以测定渗碳层的厚度,也可同时得到相应厚度渗碳层的碳含量,是准确表征渗碳层的有效方法,可以作为衡量渗碳工艺是否合适的依据。

In order to measure the suitability of the carburizing process, it is necessary to accurately determine the case depth and carbon concentration. A quick and accurate method was used to characterize the case depth and carbon concentration of 18CrNiMo7-6 steel. Firstly, the accuracy of electron probe method for the determination of case depth was verified by chemical method. Secondly, the results of electron probe method and hardness method were compared. The results of two methods for determining the case depth were consistent, while the relationship between case depth and carbon concentration was additionally shown by electron probe method. Finally, the microstructure of the carburized layer and the matrix was observed by metallographic method. Since the case depth exceeded the measurement range of metallographic method, the results could not be compared. In summary, electron probe method can obtain both case depth and carbon concentration, which is the effective method for accurately characterizing the carburized layer, and can be used as a basis for measuring the suitability of the carburizing process.