Properties of TiAl Alloy Prepared by Additive Manufacturing with Laser Coaxial Powder Feeding

被引：0
作者：
Liu Z. [1 ]
Xu G. [1 ]
Ma R. [1 ]
Zheng W. [1 ]
Hu F. [1 ]
Hang Z. [1 ]
机构：
[1] School of Material Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2019年 / 46卷 / 03期
关键词：
Laser additive manufacturing; Laser technique; Mechanical properties; Microstructure; Process parameters; γ-TiAl alloy;
D O I：
10.3788/CJL201946.0302016
中图分类号：
学科分类号：
摘要：
The alloy powders containing Ti-48Al-2Cr-2Nb and niobium are mechanically mixed, and γ-TiAl alloy samples are successfully prepared with the laser additive manufacturing technique. The influence rules of laser power, scanning speed and powder feeding amount on deposition forming are studied, and the microstructure, phase composition, fracture morphology and hardness distribution of the deposited layer are analyzed. The research results indicate that the width and height of the deposited layer increase with the increase of laser power. With the increase of the scanning speed, the width and height of the deposited layer decrease. With the increase of powder feeding amount, the width of the deposited layer increases and the height of the deposited layer is basically unchanged. The deposited samples obtained under the optimum technology parameters are well formed and have no metallurgical defects. The deposited layer consists of a large number of γ phases and a small amount of α2 phases. The compressive yield strength, compression strength and compression ratio are 905 MPa, 1542 MPa and 14.7% respectively along the Z direction of deposited specimen at room temperature. The tensile strength and elongation are 425 MPa and 3.3%, respectively. The fractures of compressive specimen and tensile specimen are both quasi-cleavage fractures. © 2019, Chinese Lasers Press. All right reserved.
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