Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys
Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys
Experiments were conducted to investigate the processing parameters that may be used to optimize the properties of Ti-6Al-4V alloys. The alloy was initially subjected to two different heat treatments leading to the formation of martensitic αʹ and lamellar α+β microstructures and then both materials were processed by high-pressure torsion (HPT) for 10 turns at room temperature. This gave significant grain refinement to the nanometer range in both conditions
and the occurrence of an allotropic hcp to fcc phase transformation in the martensitic alloy. These nanostructured alloys were subjected to post-deformation annealing (PDA) at temperatures in the range of 473 to 1023 K. The results show the hardness increases slightly to 773 K due to αʹ+fcc→α+β+fcc and α→α+β phase transformations in the martensitic αʹ and
lamellar α+β alloys and then decreases up to 1023 K due to recrystallization and grain growth. An optimum property of a very high yield strength (~1120 MPa) and ultimate tensile strength (~1200 MPa), together with excellent ductility (elongation to failure of ~26%), was achieved in the Ti-6Al-4V martensitic alloy processed by a combination of HPT followed by PDA at 873 K for 60 min.
419-426
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 December 2017
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed and Langdon, Terence G.
(2017)
Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys.
Acta Materialia, 141, .
(doi:10.1016/j.actamat.2017.09.018).
Abstract
Experiments were conducted to investigate the processing parameters that may be used to optimize the properties of Ti-6Al-4V alloys. The alloy was initially subjected to two different heat treatments leading to the formation of martensitic αʹ and lamellar α+β microstructures and then both materials were processed by high-pressure torsion (HPT) for 10 turns at room temperature. This gave significant grain refinement to the nanometer range in both conditions
and the occurrence of an allotropic hcp to fcc phase transformation in the martensitic alloy. These nanostructured alloys were subjected to post-deformation annealing (PDA) at temperatures in the range of 473 to 1023 K. The results show the hardness increases slightly to 773 K due to αʹ+fcc→α+β+fcc and α→α+β phase transformations in the martensitic αʹ and
lamellar α+β alloys and then decreases up to 1023 K due to recrystallization and grain growth. An optimum property of a very high yield strength (~1120 MPa) and ultimate tensile strength (~1200 MPa), together with excellent ductility (elongation to failure of ~26%), was achieved in the Ti-6Al-4V martensitic alloy processed by a combination of HPT followed by PDA at 873 K for 60 min.
Text
Shahmir-Acta-final
- Accepted Manuscript
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Accepted/In Press date: 11 September 2017
e-pub ahead of print date: 13 September 2017
Published date: 1 December 2017
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Local EPrints ID: 413974
URI: http://eprints.soton.ac.uk/id/eprint/413974
ISSN: 1359-6454
PURE UUID: ac203061-e7f8-44ab-b3e8-234a0c31e0b6
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Date deposited: 12 Sep 2017 16:31
Last modified: 16 Mar 2024 05:43
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Author:
Hamed Shahmir
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