Processing map-microstructure evolution correlation of hot compressed near alpha titanium alloy (TiHy 600)

Kumar, K B and Saxena, K K and Dey, Suhash Ranjan and Pancholi, V and Bhattacharjee, A (2017) Processing map-microstructure evolution correlation of hot compressed near alpha titanium alloy (TiHy 600). Journal of Alloys and Compounds, 691. pp. 906-903. ISSN 0925-8388

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Hot compression tests on TiHy 600 alloy (equivalent to IMI 834) is performed using Gleeble-3800® thermo-mechanical simulator. The hot deformation behaviour of TiHy 600 alloy is characterized on the basis of flow stress variation with true stress-true strain curves at different strain rates ranging from 10−3 s−1 to 10 s−1 and hot deformation temperatures ranging from 900 °C to 1050 °C, with maximum engineering strain up to 50%. The flow stress is found to be strongly dependent on deformation temperature, strain rate and strain, and it decreases with increasing temperature and decreasing strain rate. The flow curves at various temperatures and strain rates also showed dynamic recrystallization process at temperature range (900 °C–975 °C) in all strain rates and dynamic recovery process at high temperature range (1000 °C and above) in all the strain rates. Using flow stress values from the true stress-true strain curves and by applying dynamic material modeling approach, processing maps are developed at various true strains of 0.3, 0.4, 0.5 and 0.6. Processing maps exhibited safe and unsafe domains with varying efficiency of power dissipation values. Safe and unsafe domains at 0.6 strain are derived from their flow curves are correlated with its related microstructures and misorientation distribution profiles. Hot compression at 900 °C (α-rich region) mostly resulted into new fine dynamic recrystallized equiaxed α grains along grain boundaries of large deformed α grains. Higher temperature (950 °C–975 °C) compression in the (α+β) region generated mixture of deformed large alpha grains containing subgrain boundaries and secondary α laths generates from deformed β. Further compression at higher temperature (1000 °C -β-rich region and 1050 °C -single β region) resulted in the formation of secondary α laths from deformed β with few equiaxed α grains at 1000 °C sample only. The misorientation profile of α phase corroborates with the deformation mechanism in α region through its equiaxed α grains and in β region through its secondary α variant laths misorientations.

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IITH Creators:
IITH CreatorsORCiD
Dey, Suhash Ranjan
Item Type: Article
Additional Information: The authors are acknowledging the help of Dr. S.V. Kamat (Director DMRL, India) for providing the initial material under GTMAP program.
Uncontrolled Keywords: Hot deformation; Thermo-mechanical simulator; Flow stress; Processing map; Dynamic recrystallization; Misorientation
Subjects: Others > Metallurgy
Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: Team Library
Date Deposited: 06 Sep 2016 05:10
Last Modified: 07 Sep 2017 07:22
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