Dynamic behavior and defect control in LPBF of quartz glass: Insights from VOF model simulations

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-17 DOI:10.1016/j.powtec.2024.120450

Yating Qiu , Tian Yang , Hankun Zhu , Wei Han , Koji Sugioka , Lingbao Kong

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Abstract

This study investigates laser powder bed fusion (LPBF) applied to quartz glass powder through numerical simulations using the Volume of Fluid (VOF) model. A comprehensive LPBF model was developed to explore dynamic processes and defect formations. The influence of LPBF parameters on solidification quality was quantitatively analyzed, categorizing melting and solidification into four distinct types. Key results include a quantified heat-affected depth of 110 μm and a partial melting depth of 27 μm. The study also identifies keyhole-induced porosity, driven by asymmetry in keyhole geometry, recoil pressure, surface tension, and gravity, and presents two distinct bubble dynamics along with spattering phenomena. Multi-track scanning simulations revealed that preheating from initial tracks improves subsequent track quality by reducing defects. The results highlight the longer duration required to stabilize the molten pool in quartz glass compared to metals, providing valuable insights into parameter optimization for LPBF of quartz glass.

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石英玻璃 LPBF 中的动态行为和缺陷控制：VOF 模型模拟的启示

本研究通过使用流体体积（VOF）模型进行数值模拟，对应用于石英玻璃粉末的激光粉末床熔融（LPBF）进行了研究。建立了一个全面的 LPBF 模型，以探索动态过程和缺陷形成。定量分析了 LPBF 参数对凝固质量的影响，将熔化和凝固分为四种不同类型。主要结果包括量化的热影响深度为 110 μm，部分熔化深度为 27 μm。该研究还确定了由钥匙孔几何形状不对称、反冲压力、表面张力和重力驱动的钥匙孔诱发孔隙率，并呈现了两种不同的气泡动力学和溅射现象。多轨道扫描模拟显示，从初始轨道开始预热可减少缺陷，从而提高后续轨道质量。结果突出表明，与金属相比，稳定石英玻璃熔池所需的时间更长，这为石英玻璃 LPBF 的参数优化提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.