碳与杂质在晶界呈相互排斥,而碳为更强的晶界活性元素,因此杂质在晶界的偏聚受碳在α相中固溶度的控制.合金元素的加入使碳的固溶度降低,从而促进了杂质元素的偏聚.按照这个理论,本文对Guttmann的模型作进一步推广,提出了一个定量的模型.由此计算碳钢及铬钢中磷的晶界偏聚与实验结果符合得很好。
Since carbon is a more intensive grain boundary active element and would replace the impurity at the grain boundary of steels, the grain boundary segregation of the impurity would be controlled by the carbon solubility in a-phase. The alloying elements, decreasing - the carbon solubility, would enhance the impurity segregation at the grain boundary. With this point of view, a new modified Guttmann's model is suggested from which the calculated results are in good agreement with the experimental data in carbon and Cr steels.
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