Título
Effect of Boron Content and Cooling Rate on the Microstructure and Boride Formation of β-Solidifying γ-TiAl TNM AlloyAutor-a (de otra institución)
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ITP S.A.Versión
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© 2020 by the authors. Licensee MDPI, Basel, SwitzerlandAcceso
Acceso abiertoVersión del editor
https://doi.org/10.3390/met10050698Publicado en
Metals Vol. 10. N.5. N. artículo 698, 2020Editor
MDPI AGPalabras clave
titanium aluminide
casting
boride
cooling rate ... [+]
casting
boride
cooling rate ... [+]
titanium aluminide
casting
boride
cooling rate
chemical composition [-]
casting
boride
cooling rate
chemical composition [-]
Resumen
Boron is a unique and popular grain refiner element in cast titanium aluminide (TiAl) alloys, as it helps to improve mechanical properties if properly alloyed. However, the formation mechanism of diff ... [+]
Boron is a unique and popular grain refiner element in cast titanium aluminide (TiAl) alloys, as it helps to improve mechanical properties if properly alloyed. However, the formation mechanism of different types of borides in cast TiAl alloys is not yet clearly understood. This study seeks to correlate the chemical composition and cooling rate during solidification of cast TiAl alloys, with the type of boride precipitated and the resulting microstructure. Several β-solidifying γ-TiAl alloys of the TNM family were cast, alloying boron to a starting Ti-44.5Al-4Nb-1Mo-0.1B (at.%) alloy. The alloys were manufactured with an induction skull melting furnace and poured into a stepped 2, 4, 8 and 16 mm thickness mold to achieve different cooling rates. On one hand, the results reveal that boron contents below 0.5 at.% and cooling rates during solidification above 10 K/s promote the formation of detrimental ribbon borides. On the other hand, boron contents above 0.5 at.% and cooling rates during solidification below 10 K/s promote the formation of a refined microstructure with blocky borides. Finally, the formation mechanisms of both ribbon and blocky borides are proposed. [-]
Sponsorship
Gobierno VascoID Proyecto
GV/Programa de apoyo a la I+D Empresarial Hazitek 2017/ZE-2017-00029/CAPV/Turbinas de Alta velocidad: Desarrollo de tecnologías de fabricación Avanzada/TALDEAColecciones
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