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http://dx.doi.org/10.12656/jksht.2019.32.5.195

The Effects of Cyclic Heat Treatment Process for Fine Microstructure of TiAl Cast Alloy  

Kong, Man-Sik (Advanced Materials & Processing Center, Institute for Advanced Engineering)
Yang, Hyunseok (Advanced Materials & Processing Center, Institute for Advanced Engineering)
Publication Information
Journal of the Korean Society for Heat Treatment / v.32, no.5, 2019 , pp. 195-200 More about this Journal
Abstract
For expanding the applications and workability of TiAl alloy, elongation is very important property. Fine microstructure is needed for elongation and physical properties of TiAl alloys. In this study, The effects of cyclic heat treatment process for fine microstructure of Ti-46Al-Nb-W-Cr-Si-C alloy, which was made by VAR (vacuum arc remelting) and VIM(vacuum induction melting) centrifugal casting process, was investigated. Cycle heat treatment process was very effective for recrystallization of this TiAl system, which has microstructure size of $50{\sim}100{\mu}m$ through pre-heat treatment, cyclic heat treatment in ${\alpha}+{\gamma}$ phase region and solution heat treatment respectively. Refined grain size was finally confirmed by photos of optical microscope and scanning electron microscope.
Keywords
TiAl cast alloy; Cyclic heat treatment; Elongation; Cooling rate; Grain refinement;
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