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针对脉冲离子渗碳过程的模拟计算，提出了两种优化工艺计算方法．采用扩散系数随温度和碳的质量分数而变化的非线性数学模型，提高了计算精度．讨论了优化计算程序实现中的一些环节以及优化方法、扩散系数、碳的质量分数上限、吸碳率对优化结果的影响，并结合实验结果计算了传统的“周期法”渗碳工艺和优化后的工艺在同一渗碳条件下的碳的质量分数分布．结果表明：采用优化工艺后，在相同时间内达到的有效渗层深度明显增加．在相同条件下，“恒渗法”的渗碳速度高于“渗扩法”
Aiming at the simulation calculation of pulsed ion carburizing process, two optimization methods are proposed. Adopting the non-linear mathematical model that the diffusion coefficient changes with the temperature and the mass fraction of carbon, the calculation accuracy is improved. Some links in the process of optimization calculation, as well as the optimization method, diffusion coefficient, upper limit of mass fraction of carbon and carbon adsorption rate on the optimization results were discussed. The traditional “cycle method” carburization process and optimization Of the same carburizing process under the conditions of carbon mass fraction distribution. The results show that the depth of effective permeation achieved at the same time after the optimization process is obviously increased. Under the same conditions, the carburizing rate of “constant infiltration method” is higher than that of “infiltration method”