Enhancing the spatter-removal rate in laser powder-bed fusion using a gas-intake system with dual inlets  

作　　者：Xin TIAN Junwei ZHONG Youwen YANG Chaolei ZHANG Long ZHAO 

机构地区：[1]School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou,341000,China [2]College of Engineering and Applied Science,Nanjing University,Nanjing,210089,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2025年第3期252-265,共14页浙江大学学报(英文版)A辑(应用物理与工程)

基　　金：supported by the Natural Science Foundation of Jiangxi Province(Nos.20224BAB214061 and 20224ACB214008);the National Natural Science Foundation of China(Nos.52165043 and 52166002);the Jiangxi Provincial Cultivation Program for Academic and Technical Leaders of Major Subjects(No.20225BCJ23008);the Anhui Provincial Natural Science Foundation(No.2308085ME171);the University Synergy Innovation Program of Anhui Province(Nos.GXXT-2023-025 and GXXT-2023-026),China。

摘　　要：Mounds of spatter are generated in laser powder-bed fusion(L-PBF)additive manufacturing,which reduces build quality and laser lifetime.Due to the lack of supplemental airflow above the chamber,the conventional build chamber with a single gas inlet exhibits a pronounced tendency for gas to flow upward near the outlet.This phenomenon results in the formation of a large vortex within the build chamber.The vortex leads to the chaotic motion trajectory of the spatter in the build chamber.The design defects of the existing build chamber based on dual gas inlets are shown in this paper.We established a coupled computational fluid dynamics-discrete phase model(CFD-DPM)model to optimize the build chamber by adjusting the position and structure of the second gas inlet.The homogeneity of the flow is increased with a distance of 379 mm between the two inlets and a wider-reaching second inlet.The Coanda effect is also crucial in the spatter-removal process.The Coanda effect is reduced by modifying the right sidewall of the build chamber and increasing the pressure difference between the inlet and outlet.Finally,we found that the spatter-removal rate rose from 8.9%to 76.1%between the conventional build chamber with a single gas inlet and the optimized build chamber with two gas inlets.

关 键 词：Laser powder-bed fusion(L-PBF) Computational fluid dynamics(CFD) Flow field simulation Structural optimization Coanda effect 

分 类 号：TG1[金属学及工艺—金属学]