HOT FORGING OF BIOMEDICAL Β-TI ALLOY STRENGTHENED BY HIGH OXYGEN CONTENT

1 PREISLER Dalibor
Co-authors:
1 STRÁSKÝ Josef 1 KRÁL Robert 1 JANEČEK Miloš
Institution:
1 Charles University in Prague, Faculty of Mathematics and Physics, Department of Physics of Materials, Ke Karlovu 5, 121 16, Praha 2, Czech Republic, EU, preisler.dalibor@gmail.com
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1310-1314
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
16 views / 4 downloads
Abstract

Beta titanium alloy, Ti-35Nb-6Ta-7Zr-0.7O (wt.%), differs from most of Ti-Nb-Zr-Ta based biomedical alloys by its very high oxygen content, which provides a significant interstitial solution strengthening. However, there is a need for thermomechanical processing due to the poor fatigue resistance after casting. This is caused by a residual porosity in the ingot and large grains (size > 1 mm). Die forging was used to work the cast rod with diameter of 45 mm into rods with diameters of 35 mm and 25 mm. Resulting microstructure and mechanical properties are evaluated and discussed. Heavily deformed microstructure with deformation bands is found in the 35 mm rod without apparent grain refinement. Further forging to 25 mm leads to recrystallization and significant refinement of grain size. Porosity observed in cast condition is removed by thermomechanical processing. Yield and tensile strength are improved while the fatigue performance remains low.

Keywords: Beta titanium, biocompatibility, die-forging, tensile testing, fatigue testing
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