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| Effect of Hot Salt Corrosion Environment on High Temperature Life of TC11 Titanium Alloy |
| Received:October 30, 2023 Revised:December 11, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.12.006 |
| KeyWord:hot salt corrosion TC11 titanium alloy corrosion fatigue stress corrosion failure mechanism corrosion fatigue fracture |
| Author | Institution |
| FANG Yu-hang |
School of Power and Energy, Northwestern Polytechnical University, Xi'an , China |
| JING Xin |
School of Power and Energy, Northwestern Polytechnical University, Xi'an , China |
| REN Wan-cong |
School of Power and Energy, Northwestern Polytechnical University, Xi'an , China |
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| Abstract: |
| The work aims to conduct hot salt corrosion fatigue and stress corrosion tests of TC11 titanium alloy to investigate the high temperature life decay characteristic and failure mechanism of TC11 titanium alloy components in engines under corrosion environment and working load. The TC11 titanium alloy samples was prepared by salt spray method to investigate the effects of different temperature and stress levels on corrosion fatigue and stress corrosion of TC11. The fracture and surface morphology of corrosion fatigue and stress corrosion samples and the failure mechanism were analyzed by SEM and other observation means. Hot salt corrosion environment reduced the life of TC11 titanium alloy, the corrosion fatigue life dropped by two orders of magnitude and the stress corrosion life was less than 1%, compared with the non-corrosion life, and the dispersion was relatively large. By observing the corrosion fatigue and stress corrosion samples, it could be found that there were obvious corrosion pits on the surface and cracks on the bottom of the corrosion pits. The hot salt corrosion fatigue life and hot salt stress corrosion life of TC11 titanium alloy in hot salt environment decrease obviously. Many pits on the surface of titanium alloy samples caused by corrosion form approximatively notches. The stress concentration at the notch is an important factor leading to the decay of corrosion fatigue life. The corrosion fatigue life is lower than the non-corrosion fatigue life of Kt=1 but greater than that of Kt=3. |
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