Investigation of Interaction Between Dendritic Crystal Growth, Microporosity Formation, and Melt Convection on Micro and Macroscales

微观和宏观尺度上枝晶生长、微孔形成和熔体对流之间相互作用的研究

• 批准号: 0226021
• 负责人: Andrey Kuznetsov
• 金额: $ 7.44万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-02-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0226021&HistoricalAwards=false
• 关键词: Investigation; Interaction; Between; Dendritic; Crystal

The proposal deals with models and experiments to study microporosity in casting. The goal is to understand how microstructure formation is influenced by microporosity growth and convective flow of an alloy liquid phase. Three distinct tasks have been laid out. The first is to use a phase field method to simulate the interaction among dendritic growth, microporosity formation and melt flow. These results will be coupled into a macroscopic model for predicting microporosity nucleation, growth, agglomeration, and migration. Finally, experiments will be conducted at Oak Ridge National Laboratory to provide data for validation of the predictions. If successful, the research will contribute to the fundamental understanding of microporosity formation. The computer codes to be developed could be used by commercial casting code developers to improve the modeling capability with respect to this important element of solidification processing. The present award will concentrate on the microscale modeling of microporosity formation and on developing the methodology for coupling this model with a macroscopic model. Planning for validation experiments will also be carried out, in anticipation of a future extensive collaboration with ORNL.

提出了用模型和实验方法研究铸件微孔隙的方法。目的是了解微观结构的形成是如何受到微孔生长和合金液相对流流动的影响。已经提出了三个不同的任务。一是采用相场法模拟枝晶生长、微孔隙形成和熔体流动之间的相互作用。这些结果将耦合到预测微孔隙成核、生长、团聚和迁移的宏观模型中。最后，实验将在橡树岭国家实验室进行，为验证预测提供数据。如果成功，该研究将有助于对微孔隙形成的基本认识。要开发的计算机代码可以被商业铸造代码开发人员用来提高关于凝固过程中这一重要元素的建模能力。目前的奖项将集中于微孔隙形成的微观尺度建模，以及开发将该模型与宏观模型耦合的方法。计划验证实验也将进行，预计未来将与ORNL广泛合作。