Effect of Process and Geometric Parameters on Residual Distortion of Ti-6Al-4V Body-Centered Cubic Lattice Structures in Laser Powder Bed Fusion  

作　　者：Yupei Tian Jian He Huilin Ren Xinmeng Zha Kaijie Lin Mingdong Zhou Yi Xiong 

机构地区：[1]School of System Design and Intelligent Manufacturing,Southern University of Science and Technology,Shenzhen,518055,China [2]Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China [3]Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,200240,China

出　　处：《Additive Manufacturing Frontiers》2024年第4期191-198,共8页增材制造前沿(英文)

基　　金：supported by National Key Research and Development Program of China(Grant No.2021YFB1715400);National Natural Science Foundation of China(Grant No.52105261);High-level Special Funds at the Southern University of Science and Technology(Grant No.G03034K003).

摘　　要：The advent of laser powder bed fusion(LPBF)has provided an effective solution for fabricating lightweight structures with intricate designs that cannot be realized using other manufacturing methods.Lattice structures,however,which feature unique characteristics,pose greater challenges in the LPBF process than solid structures and exhibit more significant distortion.The underlying mechanisms and influencing factors of this distortion remain unclear,presenting a significant research gap.This study investigates the generation mechanism of residual stress in Ti-6Al-4V lattice structures during LPBF and examines how process and geometric parameters influence residual distortion.Lattice-type cantilever structures with various arm thicknesses and strut diameters were fabricated using different laser powers and scan patterns.The residual distortion after removal from the building substrate was measured using a non-contact coordinate-measuring machine.The results suggest that increasing the arm thickness,reducing the strut diameter,and employing a scanning pattern with interlayer rotation effectively reduce residual distortion.Among these factors,the scanning pattern had the most distinct impact,differing significantly from those affecting solid structures.P2(45°)scanning pattern resulted in the greatest residual distortion,approximately twice that of the least distorted pattern.Meanwhile,the laser power exerted a minor influence on the distortion of the lattice structures.These findings provide insights and guidance for fabricating lattice structures using the LPBF process,broadening its applications in aerospace,automotive,and other weight-sensitive industries.

关 键 词：LPBF TI-6AL-4V Lattice structures Residual distortion Residual stress 

分 类 号：TN2[电子电信—物理电子学]