Effect of solutionizing temperature and cooling rate on phase morphology, recrystallization and texture evolution in a heat treated Ti‐6Al‐4Valloy having different types of microstructure

Dixit, S and Kumar, D and Dash, BB and Suwas, S and Bhattacharjee, A and Sankaran, S (2022) Effect of solutionizing temperature and cooling rate on phase morphology, recrystallization and texture evolution in a heat treated Ti‐6Al‐4Valloy having different types of microstructure. In: Journal of Alloys and Compounds, 927 .

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Abstract

The effect of different solutionizing temperature and cooling rate on the extent of recovery, recrystallization and texture evolution in the alloy Ti‐6Al‐4V (Ti-64) has been investigated in different microstructural conditions. The hot rolled Ti-64 alloy was subjected to three different heat treatments in order to obtain three different microstructures, namely, lamellar (β-treatment), and equiaxed and bimodal (α/β-treatment). The heat treated alloys were characterized in terms of differences in phase fraction and phase dimension, the extent of recovery, recrystallization and texture evolution using SEM, EBSD, TEM, and XRD. The effect of heat treatment parameters on the volume fraction and grain size of primary α was more in bimodal microstructure than that of the equiaxed microstructure. The width of transformed α laths increases with increasing soaking temperature. Additionally, the extent of recovery and recrystallization of primary α was higher in equiaxed microstructure than in bimodal microstructure. The higher solutionizing temperature caused the dislocations in primary α to arrange themselves into lower energy substructures, which ultimately lead to subgrain formation. In transformed α laths, dislocations were generated due to lattice strain induced during β to α phase transformation. The rolling texture vanished gradually as the microstructure recovered and new recrystallized primary α grains grew. The newly formed recrystallized primary α grains and the majority of transformed α showed a moderate and strong prismatic texture respectively.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Crystallographic texture; LEDS; Recovery; Recrystallization; Ti-6Al-4V
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	06 Oct 2022 08:29
Last Modified:	06 Oct 2022 08:29
URI:	https://eprints.iisc.ac.in/id/eprint/77006

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