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VACUUM ›› 2025, Vol. 62 ›› Issue (3): 27-32.doi: 10.13385/j.cnki.vacuum.2025.03.05

• Vacuum Metallurgy and Thermal Engineering • Previous Articles     Next Articles

Failure Analysis of Pressure Leakage of Vacuum Melting ZTA15 Titanium Alloy Casting

LIU Yihui1, JIA Guocheng1, WANG Weichao1, MA Yi1, QIAO Haibin1, ZHAN Chunming2   

  1. 1. Luoyang Ship Material Research Institute, Luoyang 471000, China;
    2. Shenyang Vacuum Technology Institute Co., Ltd., Shenyang 110042, China
  • Received:2024-12-13 Online:2025-05-25 Published:2025-05-23

Abstract: The key ZTA15 titanium alloy box as the oil tank shell in the aerospace field was treated by vacuum melting casting and vacuum heat treatment. However, in the pressure test after assembly, there were frequent side wall leakage problems. In order to further explore the cause of failure, this study adoptod fault tree analysis method to systematically investigate the potential causes and successfully determine the root cause of the problem. On this basis, combined with physical and chemical testing, the failure mechanism was analyzed, and the accuracy of the positioning results was verified. In addition, through the fault recurrence experiment, the experimental results are extended to similar situations to provide reference for related industries. Based on the above comprehensive research, this study puts forward a set of targeted rectification plans to effectively solve the current air tightness problem. At the same time, practical preventive measures are extracted to avoid the reoccurrence of such titanium alloy box air tightness failure from the source, which provides important reference and inspiration for the design and manufacture of similar products in the future.

Key words: vacuum melting, vacuum heat treatment, ZTA15 titanium alloy, suppress leakage, weld, crack

CLC Number:  TG146.21

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