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利用气体渗碳的物质传递数学模型和气体渗碳ＣＡＤ软件进行了两段渗碳工艺的数值模拟计算，对两段渗碳工艺强渗期和扩散期选择的自适应原则提出了疑问，证明了其不合理性。发现Ｓ１与Ｓ２之比是随着渗碳工艺条件和渗层深度而变化的。最终碳浓度分布曲线上碳平台的长度与渗层深度有关，可以此为判据，计算由强渗期转入扩散期的最佳时间，制定两段渗碳工艺，得到满意的渗碳层浓度分布。相应的试验证明了其合理性
The gas carburizing material transfer mathematical model and the gas carburizing CAD software were used to carry out the numerical simulation of two-stage carburizing process. The questions of the self-adaptive principle of the selection of strong seepage period and diffusion period in the two-stage carburizing process were raised. Its irrationality. The ratio of S1 to S2 was found to vary with the carburizing process conditions and the depth of the layer. The final carbon concentration distribution curve on the length of the carbon platform and the depth of the infiltration layer, which can be used as a criterion, calculated from the strong infiltration into the diffusion period of the best time to develop two-stage carburization process, to be satisfied with the carburizing layer concentration distributed. The corresponding test proved its rationality