Effects of heat input on layer heterogeneity of selective laser melting Ti-6Al-4V components  

作　　者：陈昌荣 刘畅 王乾廷 练国富 黄旭 冯美艳 戴继成 Chen Changrong;Liu Chang;Wang Qianting;Lian Guofu;Huang Xu;Feng Meiyan;Dai Jicheng(School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Provincial Precision Processing Manufacturing Engineering Research Center,Fuzhou 350118,China;School of Materials Science and Engineering,Fujian University of Technology,Fuzhou 350118 China;Fujian Provincial Key Laboratory of Advanced Materials Processing and Application,Fuzhou 350118 China;Haian Rubber Group Co.,Ltd.,Putian 351254,China)

机构地区：[1]School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China [2]Fujian Provincial Precision Processing Manufacturing Engineering Research Center,Fuzhou 350118,China [3]School of Materials Science and Engineering,Fujian University of Technology,Fuzhou 350118 China [4]Fujian Provincial Key Laboratory of Advanced Materials Processing and Application,Fuzhou 350118 China [5]Haian Rubber Group Co.,Ltd.,Putian 351254,China

出　　处：《China Welding》2023年第3期51-66,共16页中国焊接（英文版）

基　　金：Project was supported by the Natural Science Foundation of Fujian Province(Grant No.2020J01873);Science and Technology Major Project of Fujian Province(Grant No.2020HZ03018);Fujian Provincial Foreign Cooperation Project of Science and Technology(Grant No.2020I1003);Fujian Provincial Special Project for Marine Economy Development(Grant No.2021-517).

摘　　要：Due to the layer-by-layer manufacturing characteristics,metallurgical process of selective laser melting(SLM)is inherently dif-ferent in the building direction because of varying conditions,thereby resulting inter-layer heterogeneity.To mitigate such anisotropy,it is of great significance to understand the effects of processing parameters on the property evolution and thus metallurgy of fabrication process.This research proposes one-factor-at-a-time experiment to investigate the influences of laser power and scanning speed on the surface qual-ity,microstructures and mechanical properties of selective laser melted Ti-6Al-4V parts.Surface quality is assessed by roughness around the printings while mechanical properties are evaluated through microhardness and tensile strengths.Phases in microstructure are quantified by XRD to correlate with mechanical properties.Fracture morphology is analyzed to understand the effect of defects and microstructure on mechanical performance.The optimized parameter corresponding to best surface quality and mechanical properties has been found respect-ively in laser power of 190 W and scanning speed of 800 mm/s.After optimization,surface roughness has decreased by 44.47%for upper surface.Yielding strength,tensile strength and elongation rate have improved by 13.17%,43.34%and 64.51%,respectively,with similar hardness and Young’s modulus.In addition,heterogeneity of mechanical properties has great improvement by a range of 31.63%-92.68%.

关 键 词：selective laser melting TI-6AL-4V inter-layer heterogeneity tensile properties heat input 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.23[一般工业技术—材料科学与工程]