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

被引：8
作者：
Liu, Tian-yu [1 ,2 ]
Liu, Hong-yu [1 ,2 ]
Yao, Qian [1 ,2 ]
Liu, Shi-bing [1 ,2 ]
Shi, Kun [1 ,2 ]
Zhang, Zhi-yong [1 ,2 ]
Li, Chong-yang [1 ,2 ]
机构：
[1] Shenyang Res Inst Foundry Co Ltd, Shenyang 110022, Peoples R China
[2] State Key Lab Light Alloy Casting Technol High En, Shenyang 110022, Peoples R China
来源：
CHINA FOUNDRY | 2021年 / 18卷 / 06期
关键词：
laser additive manufacturing; titanium alloy; composition design; heat treatment; TG146; 23; A; TI-6AL-4V; BEHAVIOR; ENERGY;
D O I：
10.1007/s41230-021-1089-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A novel alpha+beta titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti-12](AlTi2)+5[Al-Ti-14](AlV12Mo06Nb02) which was derived from Ti-6Al-4V. The nominal composition of this novel alloy was determined as Ti-6.83Al-2.28V-2.14Mo-0.69Nb-6.79Zr. In this study, the novel alloy and Ti-6Al-4V 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-6Al-4V, the novel alloy has much higher room and high temperature (600 degrees C) 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 degrees C or 970 degrees C for 1 h followed by air cooling and aging at 550 degrees C for 4 h followed by air cooling, a unique bi-modal microstructure which contains crab-like primary alpha and residual beta 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.
引用
收藏
页码：574 / 580
页数：7
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