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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12975
Title: Processing map-microstructure evolution correlation of hot compressed near alpha titanium alloy (TiHy 600)
Authors: K. B.K.
Saxena K.K.
Dey S.R.
Pancholi, Vivek
Bhattacharjee A.
Published in: Journal of Alloys and Compounds
Abstract: Hot compression tests on TiHy 600 alloy (equivalent to IMI 834) is performed using Gleeble-3800®thermo-mechanical simulator. The hot deformation behavior 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−1to 10 s−1and 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. © 2016
Citation: Journal of Alloys and Compounds (2017), 691(): 906-913
URI: https://doi.org/10.1016/j.jallcom.2016.08.301
http://repository.iitr.ac.in/handle/123456789/12975
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Dynamic recrystallization
Flow stress
Hot deformation
Misorientation
Processing map
Thermo-mechanical simulator
ISSN: 9258388
Author Scopus IDs: 57191093549
56612928200
8352504300
14071738800
8219614100
Author Affiliations: K., B.K., Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
Saxena, K.K., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Dey, S.R., Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
Pancholi, V., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Bhattacharjee, A., Titanium Alloy Group, Defence Metallurgical Research Laboratory (DMRL), Kanchanbagh, Hyderabad, Telangana 500058, India
Corresponding Author: Dey, S.R.; Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Kandi, India; email: suhash@iith.ac.in
Appears in Collections:Journal Publications [MT]

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