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本文证明了在三元以上的合金钢中,当奥氏体与碳化物相平衡时,合金元素对奥氏体中碳活度的影响具有叠加性质。根据M.Hillert模型推导了在这种条件下多元合金钢奥氏体中的碳活度的关系式,认为合金元素、铁在碳化物-奥氏体间的分配系数是很重要的。据此可以计算合金奥氏体中的碳活度,根据上述方法求出的碳活度,预测了实用合金钢内氧化型渗碳时所需要的碳势,预测值与实验结果符合较好。
This paper demonstrates that in alloy steels above ternary, the effect of alloying elements on the carbon activity in austenite is additive when the austenite and carbide phases are in equilibrium. According to the M.Hillert model, the relationship between the carbon activity in the austenite of the multi-alloyed steel under these conditions is deduced. It is considered that the alloying elements and the distribution coefficient of iron in the carbide-austenite are important. Based on this, the carbon activity in the austenite can be calculated. The carbon activity obtained from the above method predicts the carbon potential required for oxidized carburizing in practical alloy steel. The predicted value is in good agreement with the experimental results.