Hydrogen has little effect on the properties of the annealed VT8 alloy due to the increase in the quality of titanium sponge, particularly the lower oxygen concentration. Even 0.1% H does not lead to any sharp reduction of plasticity after isothermal annealing.
The presence of a notch reveals the susceptibility of the annealed VT8 alloy to hydrogen embrittlement at lower hydrogen concentrations. Notched samples are embrittled at a concentration of 0.03% H.
After quenching from the β-region the VT8 alloy is more suceptible to hydrogen embrittlement than after annealing. This is most evident after additional aging for a short time.
Hydrogen reduces the ultimate and long-term strength of the annealed VT8 alloy at temperatures up to 550°C.
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Kolachev, B.A., Livanov, V.A., Bukhanova, A.A. et al. Variation of the mechanical properties with the hydrogen content of the heat-treated alloy VT8. Met Sci Heat Treat 10, 700–703 (1968). https://doi.org/10.1007/BF00652843
- Oxygen Concentration
- Lower Oxygen