In-situ full-field mapping of melt flow dynamics in laser metal additive manufacturing
In-situ full-field mapping of melt flow dynamics in laser metal additive manufacturing
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DOI：
10.1016/j.addma.2019.100939
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发表时间：
2020-01-01
影响因子：
11
通讯作者：
Chen, Lianyi
中科院分区：
文献类型：
--
作者：
Guo, Qilin;Zhao, Cang;Chen, Lianyi
熔体流动在激光金属增材制造中起着至关重要的作用，但熔池内的熔体流动行为从未被明确提出。在这里，我们报告了通过原位高分辨率同步加速器x射线成像，通过人口众多且均匀分散的微示踪剂，在激光金属增材制造中整个熔池的每个位置中的熔体流动动力学的原位表征。在不同区域的熔池的位置特定的流动模式下的传导模式和抑郁模式熔化揭示和量化。在不同的位置在熔池的物理过程进行了识别。本文报道的全场熔体流动映射方法为研究真实的增材制造条件下的详细熔体流动动力学开辟了道路。所获得的结果为激光增材制造工艺提供了重要的见解，对于开发可靠的高保真计算模型至关重要。
Melt flow plays a critical role in laser metal additive manufacturing, yet the melt flow behavior within the melt pool has never been explicitly presented. Here, we report in-situ characterization of melt-flow dynamics in every location of the entire melt pool in laser metal additive manufacturing by populous and uniformly dispersed micro-tracers through in-situ high-resolution synchrotron x-ray imaging. The location-specific flow patterns in different regions of the melt pool are revealed and quantified under both conduction-mode and depression-mode melting. The physical processes at different locations in the melt pool are identified. The full-field melt-flow mapping approach reported here opens the way to study the detailed melt-flow dynamics under real additive manufacturing conditions. The results obtained provide crucial insights into laser additive manufacturing processes and are critical for developing reliable high-fidelity computational models.