Home Kovove Materialy-Metallic Materials 2018 Metallic Materials Vol. 56 (2018), no. 5, pp. 277-287

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Metallic Materials Vol. 56 (2018), no. 5, pp. 277-287

Title: Grain refinement of cast peritectic TiAl-based alloy by solid-state phase transformations
Author: K. KAMYSHNYKOVA, J. LAPIN
Abstract: The effect of solid-state phase transformations on grain refinement of cast peritectic TiAl-
-based alloy with nominal composition Ti-47Al-5Nb-0.2B-0.2C (at.%) has been investigated.
Three multi-stage heat treatment routes consisting of pretreatment in single α phase field
followed by air, oil or water cooling and subsequent annealing in α + γ or single α fields
were applied to refine grain structure of the alloy. The microstructure of the as-cast samples
consists of coarse fully lamellar α2(Ti3Al) + γ(TiAl) grains with a grain size of 1310 μm. The
annealing of the pretreated samples consisting of massive γM and fine lamellar α2 + γ grains
in the α + γ phase field leads to the formation of a duplex type of microstructure composed
of lamellar α2 + γ and single γ phase grains with a grain size ranging from 14 to 22 μm. The
solution annealing in the single α phase field of the pretreated samples aged in the α+γ phase
field leads to the formation of fully lamellar α2 + γ grains with a grain size ranging from 395
to 472 μm.
Keywords: titanium aluminides, TiAl, heat treatment, grain refinement, phase transformation, microstructure
Published online: 24-Oct-2018
Year: 2018, Volume: 56, Issue: 5 Page From: 277, Page To: 287
doi:10.4149/km_2018_5_277


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