PSI - Issue 53

Serhii Lavrys et al. / Procedia Structural Integrity 53 (2024) 246–253 Serhii Lavrys et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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titanium alloy.

4. Conclusions. Therefore, in this work, the regularities between the phase-structural state and the corrosion resistance of AM titanium alloy were determined and the post heat treatment for improving its anti-corrosion characteristics was proposed. The main conclusions are the following: • The AM titanium alloy provides lower corrosion resistance than the conventional wrought one that is caused by the presence of metastable martensitic structure and residual stresses in the structure. • Carrying out the post heat treatment allows to improve the corrosion resistance of AM titanium alloy and to approach it to the level of the wrought one. This improvement is mainly explained by the softening of the structure, namely the reduction of the metastable martensitic phase and the release of the corrosion- resistant β phase. • The optimal regime of post heat treatment should not exceed a temperature of 800°C, because at higher temperatures the intensive growth of α -phase grains occurs, which leads to the deterioration of the corrosion resistance of the alloy. References [2] Pohrelyuk I.M., Sheykin S.E., Dub S.M., Mamalis A.G., Rostotskii I.Y., Tkachuk O.V. and Lavrys S.M. (2016). Increasing of functionality of c.p. titanium/UHMWPE tribo-pairs by thermodiffusion nitriding of titanium component. Biotribology , 7, 38 – 45. https://doi.org/10.1016/j.biotri.2016.08.002 [3] Li Y., Zhou Z., Yi X., Yan J., Xiu J., Fang D., Shao M., Ren P., He Y. and Qiu J. (2023). Improved seawater corrosion resistance of electron beam melting Ti6Al4V titanium alloy by plasma nitriding. 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