Enhanced crack buffering of additively manufactured Ti-6Al-4V alloy using calcium fluoride particles

被引：6
作者：
Yin, Bo [1 ]
Cao, Meiguang [1 ]
Sun, Yu [1 ]
Cao, Angang [2 ]
Zhang, Zhonglin [3 ]
Leng, Zhe [1 ]
Feng, Wuwei [1 ]
Shi, Xuezhi [1 ]
Han, Ruiqi [3 ]
机构：
[1] Zhejiang Ocean Univ, Sch Marine Engn Equipment, Zhoushan 316022, Peoples R China
[2] Zhengzhou Univ Sci & Technol, Sch Mech Engn, Zhengzhou 450064, Peoples R China
[3] Harbin Engn Univ, Coll Mech & Elect Engn, Harbin 150001, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 23卷
关键词：
Crack buffering; Ti-6Al-4V alloy; Additive manufacturing; Calcium fluoride; Fracture mechanism; BETA-GRAIN-BOUNDARIES; MECHANICAL-PROPERTIES; WIRE; MICROSTRUCTURE; TITANIUM; RESISTANCE; DEFORMATION; TEMPERATURE; REFINEMENT; BEHAVIOR;
D O I：
10.1016/j.jmrt.2023.02.155
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ti-based alloys fabricated by wire and arc additive manufacturing (WAAM) exhibit continuous grain boundaries of alpha phase (GB-alpha), which easily initiate cracks and provide a continuous crack propagation path. Herein, an activating flux of CaF2 particles was introduced into WAAM-fabricated Tie6Ale4V alloy to tailor the microstructure for crack buffering (i.e., inhibit smooth propagation of cracks). The results showed that the addition of CaF2 particles disrupted the continuous GB-alpha through the dowel-like lamellar alpha phase (DL-alpha), which was primary a lamella deeply embedded in the adjacent prior-beta grains. This microstructure imparted an optimal combination of strain and strength even in the presence of pores in the WAAM-fabricated Tie6Ale4V alloy. The enhanced mechanical properties can be attributed to uniform plastic deformations and tendency to transgranular fracture of tensile specimens. DL-alpha relieved stress concentration at the grain boundary and guided cracks into the prior-beta grain interior (i.e., avoided inter-crystalline fracture), thereby promoting the crack buffering effect. The study can provide theory guidance and data support for improving the mechanical performance of WAAM-fabricated Tie6Ale4V alloy. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码：5653 / 5665
页数：13
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