Fracture toughness and stress corrosion fracture toughness of some titanium alloys

As the amount of titanium alloy increases and titanium alloys are mostly used in the main structures or important parts of marine engineering and ships, including manned submersibles, offshore engineering drilling pipelines, etc., pitting and stress corrosion are prone to occur in the marine environment Therefore, for marine titanium alloys, the stress corrosion intensity factor KISCC under the corrosive environment is more investigated.

As a very harmful failure mode, stress corrosion has caused huge losses. According to statistics, stress corrosion occurs widely in ships, chemicals, and marine engineering, accounting for 38% of corrosion failures. Moreover, stress corrosion is a failure mode without warning, which can lead to material embrittlement. Once it occurs, the crack growth rate is fast, and the stress that causes damage is much less than the yield stress. Therefore, it is necessary to conduct detailed research on its generation, development and final damage. , Thereby minimizing the damage caused by stress corrosion.

Studies have shown that many titanium alloys have stress corrosion in seawater. See the table below. From the table, we can see that common titanium alloys have stress corrosion sensitivity. Some titanium alloys have high stress corrosion sensitivity. KISCC /KIC Even if it is lower than 0.3, the application performance of the alloy is seriously degraded.

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