High-strength titanium alloy with hierarchical-microstructure design via in-situ refinement-splitting strategy in additive manufacturing

Yao，Zhifu1,2,3,4; He，Minglin5; Yi，Jiang5; Yang，Mujin5; Shi，Rongpei2,4; Wang，Cuiping6,7; Zhong，Zheng3; Yang，Tao8; Wang，Shuai5; Liu，Xingjun1,2,4

2024-01-25

10.1016/j.addma.2024.103969

Additive Manufacturing   影响因子和分区

2214-8604

Microstructure design of high-strength materials based on single-principal-microstructure advantage can hardly meet the increasingly strict service requirements of modern aviation and aerospace industries. Compared with conventional forming methods, additive manufacturing (AM) technology introduces more regulatory variables, making it possible to gain multiple microstructure advantages simultaneously for critical components. This study introduces a universal process strategy in laser-powder bed fusion (L-PBF) to achieve hierarchical-microstructure optimization for titanium alloys. Specifically, a higher energy density can refine (R) martensite lath, and an appropriate scanning strategy can split (S) both coarse prior-β grains and α’-colony. For L-PBF-fabricated Ti-6Al-4 V (Ti64) alloy, the proposed refinement-splitting (R & S) optimization strategy improved yield strength (up to ∼1.3 gigapascals) by 30% and the total elongation increase by about 1.9 times compared to the alloy samples with a conventional rich α’-colony microstructure. The split prior-β grains also help with the complex service environment by reducing the anisotropy-induced deterioration of mechanical properties. The R&S approach is, in principle, applicable also to other titanium alloys beyond Ti64.

Additive manufacturing Laser-powder bed fusion Martensite Microstructural design Titanium alloy

SCI ; EI

英语

其他

2-s2.0-85182915619

Scopus

1.State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Shenzhen,518055,China
2.Institute of Materials Genome & Big Data,Harbin Institute of Technology,Shenzhen,518055,China
3.School of Science,Harbin Institute of Technology,Shenzhen,518055,China
4.Department of Materials Science and Engineering,Harbin Institute of Technology,Shenzhen,518055,China
5.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Blvd,518055,China
6.Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials (Xiamen University),Xiamen,Fujian,361000,China
7.Xiamen Key Laboratory of High-Performance Metals and Materials (Xiamen University),Xiamen,Fujian,361000,China
8.Department of Material Science and Engineering,College of Engineering,City University of Hong Kong,Hong Kong

Yao，Zhifu,He，Minglin,Yi，Jiang,et al. High-strength titanium alloy with hierarchical-microstructure design via in-situ refinement-splitting strategy in additive manufacturing[J]. Additive Manufacturing,2024,80.

Yao，Zhifu.,He，Minglin.,Yi，Jiang.,Yang，Mujin.,Shi，Rongpei.,...&Liu，Xingjun.(2024).High-strength titanium alloy with hierarchical-microstructure design via in-situ refinement-splitting strategy in additive manufacturing.Additive Manufacturing,80.

Yao，Zhifu,et al."High-strength titanium alloy with hierarchical-microstructure design via in-situ refinement-splitting strategy in additive manufacturing".Additive Manufacturing 80(2024).