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首页> 外文期刊>International Journal of Heat and Mass Transfer >Phase-field modeling of metallic powder-substrate interaction in laser melting process
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Phase-field modeling of metallic powder-substrate interaction in laser melting process

机译：激光熔化过程中金属粉末-基体相互作用的相场建模

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摘要

Understanding fusion dynamics of metallic powders and powder-substrate interactions is important for reducing the defects, and thus improving surface and bulk quality of additive manufactured (AM) parts. Albeit recent advances in AM technology, there is a great need of theoretical analysis at the powder level to quantify and predict relevant mesoscale dynamics in the manufacturing process. We present a thermodynamically consistent phase-field modeling framework to integrate relevant thermal fluid phenomena and elastic structure response, including phase transition, thermal capillarity, interfacial deformation, and thermal stress induced by spot laser heating. The 2D results show that the fusion of pure titanium powder and titanium substrate can be significantly enhanced by the capillary effect when the partially melted powder is bridging the molten substrate, whereas the thermal-elastic deformation has a longer range effect, which is primarily influenced by the heating power of the laser beam. (C) 2018 Elsevier Ltd. All rights reserved.
机译：了解金属粉末的熔化动力学以及粉末与基材之间的相互作用对于减少缺陷，从而改善增材制造（AM）零件的表面和整体质量至关重要。尽管增材制造技术取得了最新进展，但仍非常需要粉末级别的理论分析来量化和预测制造过程中的相关中尺度动力学。我们提出了一个热力学一致的相场建模框架，以整合相关的热流体现象和弹性结构响应，包括相变，热毛细作用，界面变形和点激光加热引起的热应力。二维结果表明，当部分熔融的粉末桥接熔融的基材时，毛细作用可以显着增强纯钛粉末与钛基材的融合，而热弹性变形的作用范围更长，这主要受以下因素影响：激光束的加热功率。 （C）2018 Elsevier Ltd.保留所有权利。

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