Microstructure and property of Ti2AlNb alloy by selective electron beam melting

被引：0
|
作者：
Che Q. [1 ]
He W. [1 ,2 ]
Li H. [1 ]
Cheng K. [1 ]
Wang Y. [1 ]
机构：
[1] Xi'an Sailong Metal Materials Co., Ltd., Xi'an
[2] State Key Eaboratory for Porous Metals Materials, Northwest Institute for Nonferrous Metal Research, Xi'an
来源：
Cailiao Gongcheng/Journal of Materials Engineering | 2022年 / 50卷 / 07期
关键词：
density; mechanical property; microstructure; selective electron beam melting; Ti[!sub]2[!/sub] AINb based alloy;
D O I：
10.11868/j.issn.1001-4381.2021.000958
中图分类号：
学科分类号：
摘要：
Ti2 AINb based alloys is considered to be the most potential material material to replace the traditional Ni-based superalloys, because of its excellent high-temperature specific strength, creep resistance and high fracture toughness. Ti-22Al-25Nb alloy was fabricated by selective electron beam melting (S E B M), and the density of as-built samples reached 5.42-5.43 g/cm3 through process optimization. The microstructure, phase evolution and mechanical property of the as-built and HIPed Ti2 AINb alloy samples were investigated. The results show that the microstructure of the as-built and HIPed samples both show the columnar crystalline structures along the deposition direction, which are all composed of B2, O and α2 phases, and the amount of O/α2 phase gradually increases from top to bottom. After H I P, the width and amount of the O/α2 phase are reduced and relatively uniform when compared with that of the as-built samples. In the bottom area, the microhardness of the as-built sample exhibits higher value of about (345. 87 + 5. 09) H V, while the hardness increases to 388. 91-390. 48HV after HIP. The ultimate tensile strength and elongation of the as-built sample at room temperature are (1061 + 23.71) MPa and (3.67 + 1.15) % respectively, and the ultimate tensile strength increases to (1101 + 23.07) MPa and the elongation reduces to 3. 5% after HIP. © 2022 Beijing Institute of Aeronautical Materials (BIAM). All rights reserved.
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页码：156 / 164
页数：8
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