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Influence of phase volume fraction on the grain refining of a Ti-6Al-4V alloy by high-pressure torsion

Influence of phase volume fraction on the grain refining of a Ti-6Al-4V alloy by high-pressure torsion
Influence of phase volume fraction on the grain refining of a Ti-6Al-4V alloy by high-pressure torsion
A cold-rolled Ti-6Al-4V sheet was subjected to three different heat treatments prior to processing by high pressure torsion (HPT). Quantitative measurements revealed that the volume fractions were 70% equiaxed ? phase and 30% lamellar (? + ?) (Ti64-1), 47% equiaxed ? phase and 53% lamellar (? + ?) (Ti64-2) and 25% equiaxed ? phase and 75% lamellar (? + ?) (Ti64-3) and the grain sizes of the ? phase were 7.0 ± 2 ?m, 9.0 ± 1.5 ?m and 9.5 ± 1.5 ?m, respectively. The processing by HPT was performed at room temperature with a pressure of 6.0 GPa and a rotation speed of 1 rpm. Processing of the three heat treatment batches was conducted through a total number of revolutions, N, of 1/4, 1, 5, 10 and 20. The results show that the microhardness increases with increasing numbers of turns in HPT processing and for all three conditions stable microhardness values are reached after about 20 turns. The grain sizes after 20 turns of HPT were 115 ± 30 nm in Ti64-1, 85 ± 25 nm in Ti64-2 and 75 ± 15 nm in Ti64-3 so that the grain size decreases as the volume fraction of ? phase decreases and the lamellar (? + ?) increases.
grain refinement, hardness, high-pressure torsion, Ti-6Al-4V alloy, volume fraction
2238-7854
2-7
Fu, Jie
811d8413-43fc-4c44-adab-c18cde858a4f
Ding, Hua
09d48669-e6db-4d29-87d1-fd53d9adb24c
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Zhang, Wenjing
ea69b2c3-9481-41d4-80e4-d71ff550c62c
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Fu, Jie
811d8413-43fc-4c44-adab-c18cde858a4f
Ding, Hua
09d48669-e6db-4d29-87d1-fd53d9adb24c
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Zhang, Wenjing
ea69b2c3-9481-41d4-80e4-d71ff550c62c
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Fu, Jie, Ding, Hua, Huang, Yi, Zhang, Wenjing and Langdon, Terence G. (2015) Influence of phase volume fraction on the grain refining of a Ti-6Al-4V alloy by high-pressure torsion. Journal of Materials Research and Technology, 4, 2-7. (doi:10.1016/j.jmrt.2014.10.006).

Record type: Article

Abstract

A cold-rolled Ti-6Al-4V sheet was subjected to three different heat treatments prior to processing by high pressure torsion (HPT). Quantitative measurements revealed that the volume fractions were 70% equiaxed ? phase and 30% lamellar (? + ?) (Ti64-1), 47% equiaxed ? phase and 53% lamellar (? + ?) (Ti64-2) and 25% equiaxed ? phase and 75% lamellar (? + ?) (Ti64-3) and the grain sizes of the ? phase were 7.0 ± 2 ?m, 9.0 ± 1.5 ?m and 9.5 ± 1.5 ?m, respectively. The processing by HPT was performed at room temperature with a pressure of 6.0 GPa and a rotation speed of 1 rpm. Processing of the three heat treatment batches was conducted through a total number of revolutions, N, of 1/4, 1, 5, 10 and 20. The results show that the microhardness increases with increasing numbers of turns in HPT processing and for all three conditions stable microhardness values are reached after about 20 turns. The grain sizes after 20 turns of HPT were 115 ± 30 nm in Ti64-1, 85 ± 25 nm in Ti64-2 and 75 ± 15 nm in Ti64-3 so that the grain size decreases as the volume fraction of ? phase decreases and the lamellar (? + ?) increases.

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More information

Published date: 27 February 2015
Keywords: grain refinement, hardness, high-pressure torsion, Ti-6Al-4V alloy, volume fraction
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 371688
URI: http://eprints.soton.ac.uk/id/eprint/371688
ISSN: 2238-7854
PURE UUID: ad94dfd6-78c5-42e1-ac5f-fa5631a7921d
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 01 Dec 2014 14:43
Last modified: 15 Mar 2024 03:39

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Contributors

Author: Jie Fu
Author: Hua Ding
Author: Yi Huang ORCID iD
Author: Wenjing Zhang

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