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MICROSTRUCTURE EVOLUTION DURING ANNEALING OF CAST TIAL-BASED ALLOY

1 KLIMOVÁ Alena
Co-authors:
1 LAPIN Juraj
Institution:
1 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovakia, EU, ummsakli@savba.sk
Conference:
23rd International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 21 - 23, 2014
Proceedings:
Proceedings 23rd International Conference on Metallurgy and Materials
Pages:
1145-1150
ISBN:
978-80-87294-52-9
ISSN:
2694-9296
Published:
18th June 2014
Proceedings of the conference were published in Web of Science and Scopus.
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Abstract

Microstructure evolution, Vickers hardness and Vickers microhardness were investigated in intermetallic TiAl-based alloy with nominal composition Ti-48Al-2Nb-1Cr-0.2Si (at.%). The samples prepared from the as-received ingot and centrifugally cast turbocharger wheel were subjected to the heat treatment consisting of isothermal annealing at temperatures ranging from 1150 to 1320 °C in protective argon atmosphere and air cooling to room temperature. The effect of contamination of the alloy resulting from induction melting in a ceramic crucible and centrifugal casting into ceramic mould on the microstructure evolution during annealing is discussed.

Keywords: TiAl, heat treatment, microstructure, hardness, microhardness

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