Effect of composition and process variables on Nb(C, N) precipitation in niobium microalloyed austenite
Effect of composition and process variables on Nb(C, N) precipitation in niobium microalloyed austenite
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DOI：
10.1179/mst.1987.3.3.197
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发表时间：
1987-03
影响因子：
1.8
通讯作者：
B. Dutta;C. Sellars
中科院分区：
文献类型：
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作者：
B. Dutta;C. Sellars
成核理论和铌、碳和氮在奥氏体中的溶解度积已被用来推导出 Nb (C, N) 沉淀开始随温度和成分变化的方程。预测曲线与几位作者的实验观察结果进行了比较，以确定热机械加工变量对首选成核位点密度的影响，并将其纳入方程中。当考虑到检测降水开始的不同方法的影响时，通过方程中一致的常数，可以得到降水曲线的预测形式和观测形式之间的良好一致性。当所有铌都在溶液中时，将计算的沉淀开始曲线与再结晶动力学对成分和热机械过程变量的依赖性相结合，可以预测完全再结晶的温度下限和通过沉淀有效停止再结晶的温度上限。预测与观测结果非常吻合。 MST/495
Nucleation theory and the solubility product of niobium, carbon, and nitrogen in austenite have been used to derive equations for the start of Nb (C, N) precipitation as a function of temperature and composition. The predicted curves have been compared with the experimental observations of several authors to determine the effects of thermomechanical processing variables on the density of preferred nucleation sites and to incorporate these in the equations. Good agreement between the predicted and observed forms of precipitation curve is obtained with consistent constants in the equations when account is taken of the influence of different methods of detecting the onset of precipitation. Combining the calculated precipitation start curves with the dependence of recrystallization kinetics on composition and thermomechanical process variables when all niobium is in solution leads to prediction of the lower temperature limit for complete recrystallization and of the upper temperature limit for effective stoppage of recrystallization by precipitation. The predictions are in good agreement with observed results. MST/495