Thermodynamic Calculation of Carbide Precipitate in Niobium Microalloyed Steels

On the basis of regular solution sublattice model, thermodynamic equilibrium of austenite/carbide in Fe-Nb-C ternary system was investigated. The equilibrium volume fraction, chemical driving force of carbide precipitates and molar fraction of niobium and carbon in solution at different temperatures...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2006-11, Vol.13 (6), p.53-56
Main Authors: XU, Yun-bo, YU, Yong-mei, LIU, Xiang-hua, WANG, Guo-dong
Format: Article
Language:English
Subjects:
carbide
microalloyed steel
phase equilibrium
prediction model
thermodynamic calculation
微合金钢
热力学计算
相平衡
碳化物
预测模型
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Summary:On the basis of regular solution sublattice model, thermodynamic equilibrium of austenite/carbide in Fe-Nb-C ternary system was investigated. The equilibrium volume fraction, chemical driving force of carbide precipitates and molar fraction of niobium and carbon in solution at different temperatures were evaluated respectively. The volume fraction of precipitates increases, molar fraction of niobium dissolved in austenite decreases and molar fraction of carbon increases with decreasing the niobium content. The driving force increases with the decrease of temperature, and then comes to be stable at relatively low temperatures. The predicted ratio of carbon in precipitates is in good agreement with the measured one.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(06)60110-6