Modelling precipitate nucleation and growth with multiple precipitate species under isothermal conditions: Formulation and analysis

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• 作者：D. den Ouden ; L. Zhao ; C. Vuik ; J. Sietsma ; F.J. Vermolen
• 关键词：KWN-model ; Nucleation ; Isothermal ; Growth ; Simulation ; Multi-component ; Interaction of phases
• 刊名：Computational Materials Science
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：79
• 期：Complete
• 页码：933-943
• 全文大小：742 K

文摘

This study extends the Kampmann-Wagner-Numerical model for the nucleation and growth of precipitates. We introduce a multi-component theoretical framework for the value of the frequency of atomic attachment to a growing particle, which compares well with literature. The growth of precipitates is modelled using Zener approximations and the Gibbs-Thomson effect, where all chemical elements influence the growth rate. The model is discretised using finite-volume and time-integration techniques and subsequently applied under isothermal conditions to an industrial HSLA steel containing Nb(C,N)-, AlN- and MnS-precipitates. The simulations show the importance of the multi-component and multi-phase approach as some of the secondary phases have significant effects on other phases.