Microstructure and mechanical properties of laser additive manufactured novel titanium alloy after heat treatment

被引：1
作者：
Tian-yu Liu [1 ,2 ]
Hong-yu Liu [1 ,2 ]
Qian Yao [1 ,2 ]
Shi-bing Liu [1 ,2 ]
Kun Shi [1 ,2 ]
Zhi-yong Zhang [1 ,2 ]
Chong-yang Li [1 ,2 ]
机构：
[1] Shenyang Research Institute of Foundry Co., Ltd.
[2] State Key Laboratory of Light Alloy Casting Technology for High-end Equipment
来源：
China Foundry | 2021年 / 18卷 / 06期
关键词：
D O I：
暂无
中图分类号：
TG166.5 [钛及其合金的热处理];
学科分类号：
080201 ; 080503 ;
摘要：
A novel α+β titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti12](AlTi2)+5[Al-Ti14](AlV1.2Mo0.6Nb0.2) which was derived from Ti-6 Al-4 V. The nominal composition of this novel alloy was determined as Ti-6.83 Al-2.28 V-2.14 Mo-0.69 Nb-6.79 Zr. In this study, the novel alloy and Ti-6 Al-4 V alloy samples were prepared by laser additive manufacturing. The microstructure, micro-hardness, room/high temperature tensile properties of the as-deposited samples were investigated. Compared to Ti-6 Al-4 V, the novel alloy has much higher room and high temperature(600 ℃) tensile strengths, which are 1,427.5 MPa and 642.2 MPa, respectively; however, it has a much lower elongation(3.2%) at room temperature because of the finer microstructure. To improve the elongation of the novel alloy, heat treatment was used. After solution at 960 ℃ or 970 ℃ for 1 h followed by air cooling and aging at 550 ℃ for 4 h followed by air cooling, a unique bi-modal microstructure which contains crab-like primary α and residual β phase is obtained, improving the compression elongation by 80.9% compared to the as-deposited samples. The novel alloy can be used as a high-temperature and high-strength candidate for laser additive manufacturing.
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页码：574 / 580
页数：7
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