Tailoring hierarchical microstructures to improve the strength and plasticity of a laser powder bed fusion additively manufactured Ti-6Al-4V alloy

被引：16

作者：

Lu, S. L. ^{[1
,2
]}

Zhang, Z. J. ^{[1
,2
]}

Liu, R. ^{[1
]}

Qu, Z. ^{[1
,2
]}

Li, S. J. ^{[1
,2
]}

Zhou, X. H. ^{[1
]}

Duan, Q. Q. ^{[1
]}

Zhang, B. N. ^{[3
]}

Zhao, X. M. ^{[3
]}

Zhao, W. ^{[3
]}

Ramasamy, P. ^{[4
]}

Eckert, J. ^{[4
,5
]}

Zhang, Z. F. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China

[3] Xian Bright Laser Technol Co Ltd, Xian 710000, Peoples R China

[4] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

[5] Univ Leoben, Chair Mat Phys, Dept Mat Sci, Jahnstr 12, A-8700 Leoben, Austria

来源：

ADDITIVE MANUFACTURING | 2023年 / 71卷

基金：

中国国家自然科学基金;

关键词：

Laser powder bed fusion; Titanium alloy; Heat treatment; Microstructure; Mechanical properties; HEAT-TREATMENT; FRACTURE-TOUGHNESS; TENSILE PROPERTIES; TITANIUM-ALLOY; PHASE; MECHANISMS; BEHAVIOR; EQUATION;

D O I：

10.1016/j.addma.2023.103603

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coupling effect of hierarchical microstructural features at different length scales in a laser powder bed fusion (L-PBF) additively manufactured (AM) Ti-6Al-4 V alloy obfuscates the relation between microstructure and mechanical properties. In this study, the contributions of specific microstructures to the strength and plasticity are clarified by controlling hierarchical microstructures via two-stage heat treatments. It is interesting to find that the tensile strength is only determined by the content of fine alpha' martensites and the lath thickness, while the plasticity is influenced by the prior beta grain size and lath length. A synchronous improvement of strength and plasticity can be achieved by increasing the alpha' fraction and refining the prior beta grains and alpha laths. The present findings provide guidance for optimizing the overall mechanical properties of L-PBF AM fabricated titanium components.

引用

页数：8

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