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| Effect of Temperature on Stress Corrosion Behavior of Ti-alloy Ti80 in Sea Water |
LI Wenju1,2, ZHANG Huixia2, ZHANG Hongquan1( ), HAO Fuyao2, TONG Hongtao2 |
1.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2.State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao 266237, China |
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Abstract In order to promote the application of Ti80 alloy for marine engineering, the influence of temperature variation on the stress corrosion behavior of the Ti-alloy was studied via constant displacement stress corrosion test and slow strain rate tensile test (SSRT), as well as electrochemical impedance spectroscopy, Mott-Schottky curve measurement, three-dimensional video microscopy and scanning electron microscopy (SEM). The results show that in atmospheric pressure and temperature range of 5-35 ℃, with the decrease of temperature, the stress corrosion cracking sensitivity index of Ti80 alloy gradually increases, the value of critical strength factor K1SCC gradually decreases, and the stress corrosion tendency increases. In low-temperature seawater, the fractured surface of Ti80 alloy even presents characteristics of locally river-like and tearing ridge-like quasi-cleavage. This may be ascribed to that on the local area around the crack tip, the formed passivation film possesses small resistance, while there exists more defects, and easy stacking of dislocations, thus resulted in local stress concentration in the passivation film, further due to the synergy of the existed film stress and the applied stress, the crack nucleation and expansion may speed up, therewith damages on the passivation film may be hard repaired, and thus the stress corrosion rate may spontaneously be accelerated.
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Received: 25 January 2022
32134.14.1005.4537.2022.028
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| Fund: National Natural Science Foundation of China(51931008) |
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