Effect of Oxygen and Co/TiAl Synergism on the Organization and Mechanical Properties of Laser Additive IN718 Alloy
ZHU Tao1, WU Wenxing1, YANG Tong1, CHEN Pinghu1, GUO Liangliang1, JIN Xuming1, ZOU Xinchang2, QIU Changjun1,*
1 Hunan Provincial Key Laboratory of Equipment Safety Service Technology Under Abnormal Environment, University of South China, Hengyang 421001,Hunan China 2 Yueyang Continental Laser Technology Co., Ltd., Yueyang 414000, Hunan, China
Abstract: IN718 alloy is widely used due to its excellent performance, it is important to improve the performance and service temperature of IN718 alloy at high temperatures. In this work, the content of oxygen and Co/TiAl in the alloy was adjusted through compositional control to prepare a high-strength crack-free laser additive specimen, and the organizational structure and mechanical properties of the specimen were analyzed. The results show that as the oxygen content and the Co/TiAl mass ratio incnease, the specimen tissue structure is refined and the mechanical properties are substantially improved. Increasing Co/TiAl mass ratio enhances the strength and hardness of the specimen;the increase of oxygen content promotes the formation of fine oxides on the grain boundaries, which have no significant effect on the specimen properties at room temperature. In a 900 ℃ high-temperature environment, grain boundary oxides play a role in pinning and the synergistic Co, Ti, Al reinforcing effect of high-temperature performance enhancement of the specimen. When the oxygen content is 3.8×10-4 and Co/TiAl mass ratio is 0.88, without a heat treatment process, the specimen at 900 ℃ compared to the mechanical properties of the IN718 specimen is greatly improved, the balance between strength and elongation of the better. It has great application prospect in the field of repairing hot end parts of aero-engine.
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2025, Vol. 39 
