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首页> 外文期刊>Journal of Computational Physics >Phase-field simulation of microstructure formation in technical castings - A self-consistent homoenthalpic approach to the micro-macro problem
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Phase-field simulation of microstructure formation in technical castings - A self-consistent homoenthalpic approach to the micro-macro problem

机译：技术铸件中微观结构形成的相场模拟-解决微观宏问题的自洽同焓方法

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摘要

Performing microstructure simulation of technical casting processes suffers from the strong interdependency between latent heat release due to local microstructure formation and heat diffusion on the macroscopic scale: local microstructure formation depends on the macroscopic heat fluxes and, in turn, the macroscopic temperature solution depends on the latent heat release, and therefore on the microstructure formation, in all parts of the casting. A self-consistent homoenthalpic approximation to this micro-macro problem is proposed, based on the assumption of a common enthalpy-temperature relation for the whole casting which is used for the description of latent heat production on the macroscale. This enthalpy-temperature relation is iteratively obtained by phase-field simulations on the microscale, thus taking into account the specific morphological impact on the latent heat production. This new approach is discussed and compared to other approximations for the coupling of the macroscopic heat flux to complex microstructure models. Simulations are performed for the binary alloy Al-3at%Cu, using a multiphase-field solidification model which is coupled to a thermodynamic database. Microstructure formation is simulated for several positions in a simple model plate casting, using a one-dimensional macroscopic temperature solver which can be directly coupled to the microscopic phase-field simulation tool.
机译：进行技术铸造过程的微观结构模拟时，由于局部微观结构的形成而产生的潜热释放与宏观尺度上的热扩散之间存在强烈的相互依赖性：局部微观结构的形成取决于宏观热通量，而宏观温度解则取决于宏观热通量。在铸件的所有部件中释放潜热，并因此释放微结构。基于整个铸件具有一个共同的焓-温度关系的假设，提出了对此微观-宏观问题的自洽同焓近似，该关系用于宏观上描述潜热的产生。通过在微尺度上通过相场模拟迭代获得该焓-温度关系，从而考虑了对潜热产生的特定形态学影响。对这种新方法进行了讨论，并将其与将宏观热通量耦合到复杂的微观结构模型的其他近似方法进行了比较。使用与热力学数据库耦合的多相场凝固模型，对二元合金Al-3at％Cu进行了模拟。使用一维宏观温度求解器，可以将其直接连接到微观相场模拟工具，从而在简单的模型平板铸造中模拟几个位置的微观结构形成。

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