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

Journal info

Select Journal

Webshop Cart

Your Cart is currently empty.

Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.

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

Title: Grain refinement of cast peritectic TiAl-based alloy by solid-state phase transformations

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

download file

© AEPress s.r.o
Copyright notice: For any permission to reproduce, archive or otherwise use the documents in the ELiS, please contact AEP.