Research Progress on Microstructure and Mechanical Properties of Titanium Alloy and Titanium Matrix Composites by Laser Melting Deposition
XIE Lechun 1, 2 , LIU Bingliang 1, 2 , SUN Xuan 1, 2 , BI Jian 1, 2 , GUO Haojie 3 , HAN Yuanfei 4 , WANG Liqiang 4 , LÜ Weijie 4
1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China;
2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China;
3. COMAC Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China;
4. The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract：The rapid and free forming characteristics of laser melting deposition (LMD) bring new design ideas andmanufacturing methods for the development of aeronautical components. In this paper, the microstructure and mechanical properties of laser melting deposited (LMDed) titanium alloys and titanium matrix composites (TMCs) are summarized and analyzed, including the effects of deposition parameters, heat treatment and the types and content of reinforcements on the microstructure and mechanical properties of LMDed components. It is found that the deposition parameters directly affect powder melting, the fusion quality and the microstructure of components after deposition, which influences the microstructure and properties of deposited components. By appropriate heat treatment, the forming stress could be reduced and the microstructure and properties of components can be modified. The reinforcement content is closely related to its solubility in the matrix, which makes TMCs show different microstructures and mechanical properties compared to titanium alloys. Finally, the application of LMD technology in the manufacture and repair of titanium alloy and TMCs components are analyzed and concluded.