Study on Microstructure and Properties of Laser Stereotyping Titanium Corner Box
SUN Xiaofeng1,2, RONG Ting1,2, ZHAN Xiaohong2,3
1. COMAC Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China;
2. National Engineering and Research Center for Commercial Aircraft Manufacturing, Shanghai 201324, China;
3. Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
The outer wing wall of civil aircraft is usually constructed with T-truss structure. The long girder connection structure at the root of the wing is a vital force transmission structure. The long truss structure at the root of the wing is mainly connected with the corresponding corner box. In this paper, the evolution rule, mechanical properties, and defects of titanium alloy long girder angle box of civil aircraft were studied by using laser stereotyping technology. The internal microstructure of the furnace sample is small rod-shaped α phase, there is no anisotropy in performance, and is net basket structure. The tensile strength of the test block in the X、Y and Z directions is higher than 889 MPa, and the degree and dispersion of its deviation from the average tensile strength in three directions of X、Y and Z are not exceeded over 5%, indicating good overall performance; The tensile fracture of the sample belongs to ductile fracture, and the tensile fracture is composed of three parts: fiber zone, radiation zone, and shear lip zone. Fatigue fracture is plastic fracture, and in fatigue fracture, secondary cracks are continuous and dense. The size and forming quality of the processed sample meet industry usage requirements.
孙小峰, 荣婷,占小红. 激光立体成形钛合金角盒的组织与性能研究[J]. 航空制造技术, 2023, 66(20): 109-117.
SUN Xiaofeng, RONG Ting, ZHAN Xiaohong. Study on Microstructure and Properties of Laser Stereotyping Titanium Corner Box[J]. Aeronautical Manufacturing Technology, 2023, 66(20): 109-117.