PSI - Issue 59

Sviatoslav Motrunich et al. / Procedia Structural Integrity 59 (2024) 58–65 Sviatoslav Motrunich et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions 1.

EBCHM technology for the production of the Ti-6Al-7Nb medical alloy was successfully developed and implemented. The chemical composition analysis of the obtained ingot shows that the distribution of chemical elements along the length of the ingot is uniform and corresponds to the UNS R56700 grade composition and the quality of the ingot surface is satisfactory. 2. The microstructure study shows that obtained metal is a two- phase α+β titanium alloy. It was shown that the structure is hom ogeneous without signs of zonal liquation. At the boundaries of the primary β grains, the separation of α -phase layers, which have a small thickness of 1- 2 μm, is observed. In the body of the grain, the formation of lamellar (Widmannstett) morphology of α and β phase secretions is observed. The length of the packets of phases inside the grains is 10- 40 μm. 3. The tensile strength of the Ti-6Al-7Nb titanium alloy samples, obtained by the EBCHM method, meet the requirements of the UNS R56700 standards and has better plasticity and higher strength values. 4. Initial study of fatigue behaviour of obtained Ti-6Al-7Nb alloy shows good results and could be compared with Ti-6Al-4V alloy. But still more deep and precise analysis of durability and obtaining of basic S-N curves at low and high cycle fatigue region of obtained alloy is needed. Fracture analysis shows that initiation and propagation of fatigue cracks at different levels of loading is typical for α - β titanium alloys without any abnormalities. Acknowledgements This research was funded by the National Academy of Sciences of Ukraine (code no. 6541230) within the State Research Program “Support of Priority Research Areas”. References Akhonin S., Berezos V., Severyn A., Gadzyra M., Tymoschenko Y., Davydchuk N., 2019. Structure and Properties of Titanium Modified Silicon-carbide at EBCHM. 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