%A CHEN Lianguo, WANG Wensheng, ZHU Zhishou, ZHAO Yong, HUANG Jianyun, ZHANG Hai, PENG Fuhua %T Development and application of large-scale damage tolerance titanium alloy TC4-DT %0 Journal Article %D 2020 %J Acta Aeronautica et Astronautica Sinica %R 10.7527/S1000-6893.2019.23454 %P 523454-523454 %V 41 %N 6 %U {https://hkxb.buaa.edu.cn/CN/abstract/article_17753.shtml} %8 2020-06-15 %X To meet the need of large-scale damage tolerance titanium alloy for new generation fighter, this paper examines the TC4-DT titanium alloy’s composition and macrostructure control of large-scale bar and forging stock, the microstructure control during heat treatment process of large-scale forgings, the manufacturing process control of material and forgings, and the fatigue strengthening of parts. The results of large-scale ingot melting, large-scale bar and forging stock trail production, heavy section forging trail production, and structural design and manufacture show that the damage tolerance titanium alloy TC4-DT’s composition of large-scale ingots is homogeneous and the tensile strength coefficient variation of large-scale forging stocks and heavy section forgings can be reduced to about 2%. The impacts of laser shock peening, shot peening, and cold extrusion have remarkable life increment of the titanium alloy. The damage tolerance titanium alloy TC4-DT has been widely applied on new generation fighters.