Modeling Precipitation Kinetics During Heat Treatment with Calphad-Based Tools
Modeling Precipitation Kinetics During Heat Treatment with Calphad-Based Tools
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DOI：
10.1007/s11665-014-1255-6
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发表时间：
2014-12-01
影响因子：
2.3
通讯作者：
Mason, Paul
中科院分区：
文献类型：
--
作者：
Chen, Qing;Wu, Kaisheng;Mason, Paul
复杂的沉淀反应模型与完善的CALPHAD数据库相结合，提供了一种有效的方法来定制沉淀微结构，通过优化合金化学成分和热处理制度，最大限度地提高强化效果。CALPHAD方法的成功取决于能否在考虑成分和温度变化的情况下提供与工业相关的材料的基本相平衡和相变信息。介绍了新开发的TC-PRISMA程序。研究了生长模式、合金化学成分和冷却条件对多峰微结构形成的影响，以了解其热力学和动力学基础。文中还讨论了对当前模拟的准确性和适用性至关重要的实际问题，如克服平均场近似的修改、CALPHAD数据库之间的兼容性以及关键参数(特别是界面能和成核位密度)的选择。
Sophisticated precipitation reaction models combined with well-developed CALPHAD databases provide an efficient way to tailor precipitate microstructures that maximize strengthening via the optimization of alloy chemistries and heat treatment schedules. The success of the CALPHAD approach relies on the capability to provide fundamental phase equilibrium and phase transformation information in materials of industrial relevance taking into consideration composition and temperature variation. The newly developed TC-PRISMA program is described. The effect of growth modes, alloy chemistries, and cooling profiles on the formation of multimodal microstructures has been examined in order to understand the underlying thermodynamics and kinetics. Practical issues that are critical to the accuracy and applicability of the current simulations, such as modifications that overcome mean field approximations, compatibility between CALPHAD databases, and selections of key parameters (particularly interfacial energy and nucleation site densities), are also addressed.