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首页> 外文期刊>Applied Mathematical Modelling >Modelling melting and grain destruction phenomena during globular equiaxed solidification
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Modelling melting and grain destruction phenomena during globular equiaxed solidification

机译：球状等凝固过程中的熔化和晶粒破坏现象

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摘要

Melting or re-melting accompanies solidification in many technical castings. For example, during ingot casting, some crystal fragments or equiaxed grains can enter the superheated region and re-melt, while solidification continues in other regions. Solidification and remelting occurring simultaneously at different locations present an important species/energy transport mechanism, which impacts the structural/compositional homogeneity of the castings. The re-melting is typically understood as a reduction in the equiaxed grain size, but it can also lead to the destruction (disappearance) of equiaxed grains. Existing process-based models cannot treat the solidification/melting by considering both grain nucleation and destruction properly. Therefore, a new model is proposed based on a two-phase volume-average approach. In this model, nucleation of equiaxed grains occurs when inoculants (free growth sites) are activated by undercooling, while destruction of equiaxed grains occurs only when the equiaxed grains are completely re-melted by superheating. The mass, momentum, species, and enthalpy conservation equations are solved for the solidification/melting. The transport equations for the number densities of equiaxed grains and inoculants are calculated separately. A test casting (Al-7 wt.% Si) is calculated to illustrate the modelling features. This study improves understanding of grain melting and grain destruction as well as their impact on the as-solidified structure.
机译：在许多技术铸件中熔化或重新熔化伴随着凝固。例如，在铸锭铸造期间，一些晶体片段或等轴的晶粒可以进入过热区域并重新熔化，同时凝固在其他地区继续。在不同位置的同时发生凝固和重熔，呈现了重要的物种/能量传输机制，其影响铸件的结构/组成均匀性。重新熔化通常被理解为等轴晶粒尺寸的降低，但它也可以导致等轴晶粒的破坏（消失）。通过考虑谷物成核和正确破坏，现有的基于过程的模型不能治疗凝固/熔化。因此，基于两相体积平均方法提出了一种新模型。在该模型中，当通过过冷激发抗截止剂（游离生长位点）时发生等轴晶粒的成核，而仅在通过过热完全重新熔化时，仅发生等轴的颗粒的破坏。解决了凝固/熔化的质量，动量，物种和焓保护方程。交通方程用于单独计算等型晶粒和抗截损的数量密度。计算测试铸件（Al-7重量％SI）以说明建模特征。本研究提高了对谷粒熔化和晶粒损坏的理解以及对凝固结构的影响。

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  • 来源
    《Applied Mathematical Modelling》 |2021年第9期|821-838|共18页
  • 作者

    Haijie Zhang; Menghuai Wu; Peter Schumacher; Christian M.G. Rodrigues; Andreas Ludwig; Abdellah Kharicha;

  • 作者单位

    Simulation and Modeling of Metallurgy Processes Department of Metallurgy University of Leoben Franz-Jose-Str. 18 Leoben A-8700 Austria;

    Simulation and Modeling of Metallurgy Processes Department of Metallurgy University of Leoben Franz-Jose-Str. 18 Leoben A-8700 Austria;

    Casting Research Department of Metallurgy University of Leoben Leoben A-8700 Austria;

    Simulation and Modeling of Metallurgy Processes Department of Metallurgy University of Leoben Franz-Jose-Str. 18 Leoben A-8700 Austria;

    Simulation and Modeling of Metallurgy Processes Department of Metallurgy University of Leoben Franz-Jose-Str. 18 Leoben A-8700 Austria;

    Simulation and Modeling of Metallurgy Processes Department of Metallurgy University of Leoben Franz-Jose-Str. 18 Leoben A-8700 Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Melting; Solidification; Nucleation; Macrosegregation; Modelling;

    机译：融化;凝固;成核;宏指令格;造型;

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