Development of titanium alloy reinforced frame for maximum 3D printing engine

Under the leadership of Wang Huaming, academician of the Chinese Academy of Engineering, the National Engineering Laboratory for the manufacture of large-scale Metal components at Beijing University of Aeronautics and Astronautics, after more than 20 years of unremitting research, In the international lead for China's aero-engine technology to catch up with the developed countries to make a new contribution. Recently,  they has successfully developed the original core technology、 the world's largest laser augmentation manufacturing equipment (forming capacity of up to 7 m x 4 m × 3.5 m), and the world's largest 16 square meters 3D printing (a large bomber) an engine titanium alloy stiffener.

Through long-term research, the team of Wang Huaming found that there were two dominant solidification modes in the process of titanium alloy laser augmentation: epitaxial growth at the bottom of the pool and heterogeneous nucleation on the surface of the pool during the solidification of the moving pool. The active control of solidification grain morphology and mechanical properties of metal component can be realized by active control of two main ways of solidification in molten pool. The "reinforced concrete" mixed solidified grains can be obtained by man-made alternating arrangement between the two methods. The microstructure of the mixed solidified grains has not been reported at home and abroad, and the traditional metallurgical forging technology can not be prepared. This technology realizes the precise control of the structure and properties of the blade and the disc body of the whole impeller. The system, especially the key transition zone from the disc body to the blade, realizes the smooth and gradual transition of the structure and performance, and meets the requirements of the aero-engine experts.