渗氮处理是提高表面硬度、耐磨性、抗蚀性和疲劳强度的一种热处理方法。但是,在渗氮工艺参数给定的情况下,钢的原始组织对渗氮层的深度有较大的影响工件渗氮后渗氮层深度的测定一般都按照《GB11354-89钢铁零件、渗氮层深度测定和金相组织检验》进行测定,但在实际应用上,也有不便之处,本文主要以38CrMoAl和42CrMo钢为例进行了研究。 Nitriding treatment is to improve the surface hardness, wear resistance, corrosion resistance and fatigue strength of a heat treatment. However, given the nitriding process parameters, the original structure of steel has a greater impact on the depth of the nitrided layer. The nitriding depth of the nitrided layer after nitriding is generally measured in accordance with “GB11354-89 steel parts, nitriding Layer depth measurement and microstructure test ”, but in practical application, there are also inconveniences. In this paper, 38CrMoAl and 42CrMo steel were taken as examples.