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| Effect of Deep Sea Environment on the Stress Corrosion Cracking Behavior of Laser-selected Fused Ti6Al4V |
| Received:May 21, 2021 Revised:July 20, 2021 |
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| DOI：10.7643/issn.1672-9242.2022.01.018 |
| KeyWord:SLM-Ti6Al4V deep sea stress corrosion cracking hydrostatic pressure temperature dissolved oxygen concentration |
| Author | Institution |
| WU Qi-fan |
Northeastern University Joint Research Division, Shenyang National Laboratory for Materials Science, Shenyang , China |
| ZHAO Yang |
Northeastern University Joint Research Division, Shenyang National Laboratory for Materials Science, Shenyang , China |
| QI Wen-long |
Northeastern University Joint Research Division, Shenyang National Laboratory for Materials Science, Shenyang , China |
| ZHANG Tao |
Northeastern University Joint Research Division, Shenyang National Laboratory for Materials Science, Shenyang , China |
| WANG Fu-hui |
Northeastern University Joint Research Division, Shenyang National Laboratory for Materials Science, Shenyang , China |
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| Abstract: |
| This paper compares the stress corrosion resistance of Ti6Al4V prepared by additive manufacturing technology with that of traditional wrought materials in deep sea environment. The stress corrosion cracking behavior of wrought Ti6Al4V alloy (WT-Ti6Al4V) and SLM-produced Ti6Al4V alloy (SLM-Ti6Al4V) under different hydrostatic pressure (0, 4, 8 MPa), temperature (5, 15, 25 ℃) and dissolved oxygen concentration (0.36, 2, 6 mg/L) in the marine environment and the film formation behavior of passive film in deep sea environment was analyzed and compared by slow strain rate tensile, scanning electron microscopy and XPS. The experimental results show that with the decrease of dissolved oxygen concentration and temperature and the increase of hydrostatic pressure, the stress corrosion sensitivity of the two materials is significantly increased, and the relative content of TiO2 in the passive film decreases, the horizontal comparison shows that SLM-Ti6Al4V has better corrosion resistance. Different environmental parameters will affect the relative content of TiO2 in the passivation film on the material surface, thereby affecting the protective effect of the passivation film on the metal substrate. |
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