【摘要】 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更多还原

【Abstract】 The two stage carburizing technology has been simulated by using the mathematical model and CAD software of mass transfer for gas carburizing.The self adaptation principle which has been employed in the selection of carburizing stage and diffusion stage during a two stage carburizing process has been suspected and its unreasonability has been approved.It has been found out that the ratio of S 1 to S 2 changes with the process conditions and the depth of carburizing layer.There is a relationship between the platform on the final carbon profile and the depth of carburizing layer,according to that the best time to transfer from carburizing period to diffusion period can be calculated and the two stage carburizing process can be determined to get the satisfied carbon profile.Relevant experiments have been done to approv it′s reasonability.更多还原