Effect of build thickness on defects, microstructure and mechanical properties of laser-powder bed fusion Ti6Al4V alloy

doi:10.1016/j.msea.2025.147931

IMR OpenIR

	Effect of build thickness on defects, microstructure and mechanical properties of laser-powder bed fusion Ti6Al4V alloy
	Meng, L. X.1,2; Yang, H. J.3,4; Ji, H. B.1,2; Wang, S. G.1; Ren, D. C.1; Zhang, Z. J.1,2; Shao, X. H.1,2,3; Yang, J. B.1,2; Zhang, Z. F.1,2,5
通讯作者	Yang, H. J.(yanghj@szlab.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
	2025-04-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	927 页码:13
摘要	Laser-powder bed fusion (L-PBF) thin-walled parts are widely used in aerospace to realize lightweight manufacturing and the different thermal histories in complex cross sections may have an impact on the defects, microstructure and mechanical properties. However, most existing safety standards for mechanical properties are based on conventional materials or samples cut from additive manufacturing (AM) bulk billets, which may not comprehensively consider the influence of AM process. In this study, a meticulous investigation was conducted to discern the impact of build thickness (0.50-30 mm) on the defects, microstructure, and surface roughness of net- shape L-PBF Ti6Al4V specimens. Concurrently, the mechanical properties of net-shape samples were compared to those cut from bulk billets. The results show that the small spherical keyhole defects (phi< 100 mu m) were observed on the corners of net-shape specimens. As the build thickness increased, the total defect volume increased, but the volume fraction decreased. Moreover, the alpha lamella within the chessboard-like microstructure slightly coarsened. It is recommended that the safety criterion of t/d > 8 be satisfied, where "t" designates the sample thickness and "d" represents the characteristic length of the "microstructure unit" that typified by a chessboard-like block. When this safety criterion is fulfilled, neither the uniform elongation nor the ultimate tensile strength of both sets of samples exhibited a diminution in response to a reduction in sample thickness. Furthermore, as the defects and microstructure of L-PBF Ti6Al4V net-shape samples varied with build thickness, their tensile properties were highly sensitive to thickness variations compared to the samples cut from bulk billets.
关键词	Laser-powder bed fusion Ti6Al4V Build thickness Defects Microstructure Mechanical properties
资助者	Ministry of Science and Technology of China via the National Key Research & Development Plan ; National Natural Science Foundation of China ; CAS Interdisciplinary Innovation Team ; KC Wong Education Foundation ; International Joint Research Project of CAS
DOI	10.1016/j.msea.2025.147931
收录类别	SCI
语种	英语
资助项目	Ministry of Science and Technology of China via the National Key Research & Development Plan[2023YFB3712201] ; National Natural Science Foundation of China[52130002] ; National Natural Science Foundation of China[52321001] ; National Natural Science Foundation of China[52322105] ; National Natural Science Foundation of China[52261135634] ; CAS Interdisciplinary Innovation Team[JCTD-2020-10] ; KC Wong Education Foundation[GJTD-2020-09] ; International Joint Research Project of CAS[172GJHZ2022030MI]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001423940700001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180038
专题	中国科学院金属研究所
通讯作者	Yang, H. J.; Zhang, Z. F.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Suzhou Lab, Suzhou 215028, Peoples R China 4.Adv Mat Res Inst, Suzhou 215000, Peoples R China 5.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Meng, L. X.,Yang, H. J.,Ji, H. B.,et al. Effect of build thickness on defects, microstructure and mechanical properties of laser-powder bed fusion Ti6Al4V alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,927:13.
APA	Meng, L. X..,Yang, H. J..,Ji, H. B..,Wang, S. G..,Ren, D. C..,...&Zhang, Z. F..(2025).Effect of build thickness on defects, microstructure and mechanical properties of laser-powder bed fusion Ti6Al4V alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,927,13.
MLA	Meng, L. X.,et al."Effect of build thickness on defects, microstructure and mechanical properties of laser-powder bed fusion Ti6Al4V alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 927(2025):13.