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Abstract The rational control of second-phase is significant to improve the comprehensive performance of steel material, and the key point in second-phase controlling is to accurately understand its solid solution and precipitation behavior in iron matrix. The quantitative computation of balanced solid solubility of multiplex second-phase is a difficult problem in this area. This article discussed the thermodynamic model and computing method of solid solution precipitation of ternary second-phase in steel, taking the Nb-V-Ti microalloying carbonitride as an example, and introduced its engineering application in the development of Ti-bearing carbonized gear steel product. Due to the complexity of the theoretical model, we developed a general-purpose calculation software for it, which could automatically compute and analyze the controlling parameters in the model. This software is effectively applicable to the composition design, producing process control and new type development of microalloying steel, and has important practical application value.
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Received: 03 July 2009
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2010, Vol. 45 
