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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (6): 523454-523454.doi: 10.7527/S1000-6893.2019.23454

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Development and application of large-scale damage tolerance titanium alloy TC4-DT

CHEN Lianguo1, WANG Wensheng2, ZHU Zhishou3, ZHAO Yong1, HUANG Jianyun1, ZHANG Hai1, PENG Fuhua4   

  1. 1. AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610091, China;
    2. Western Superconducting Technologies Co. Ltd., Xi'an 710012, China;
    3. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
    4. AVIC Chengdu Aircraft Industrial(Group) Co. Ltd., Chengdu 610091, China
  • Received:2019-09-05 Revised:2019-10-09 Online:2020-06-15 Published:2019-12-26

Abstract: 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.

Key words: damage tolerance, titanium alloy, ingot melting, heat treatment, lamellar microstructure, process control, laser shock peening

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