Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting
Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting
Cyclic deformation and damage mechanisms in electron-beam-melted Ti-6Al-4V are investigated. As-built samples exhibit a graded microstructure over the height of 120 mm, with samples from the top having larger α-laths and higher plastic strain. After HIPing, the α-lath width is greater, with reduced grain misorientation, and lower microstructural and property gradients. In both conditions, the observed cyclic softening is dominated by a monotonic reduction in the friction stress and an increase in grain misorientation, suggesting the lath structure progressively fragments into smaller grains. As-built samples show typically lower fatigue life due to crack initiation from gas pores and lack-of-fusion defects.
Syed, A.K.
55c97988-4b79-4e09-8c62-8a2daf07e837
Parfitt, D.
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Wimpenny, D.
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Muzangaza, E.
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Chen, B.
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
4 April 2022
Syed, A.K.
55c97988-4b79-4e09-8c62-8a2daf07e837
Parfitt, D.
54ae4520-c537-4777-8823-12b8d8866e48
Wimpenny, D.
c77d2c92-329d-485a-951a-1e70aaf4c1f0
Muzangaza, E.
6043bbd1-61d5-4cb0-82c6-84a01bf148bb
Chen, B.
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
Syed, A.K., Parfitt, D., Wimpenny, D., Muzangaza, E. and Chen, B.
(2022)
Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting.
International Journal of Fatigue, 160, [106883].
(doi:10.1016/j.ijfatigue.2022.106883).
Abstract
Cyclic deformation and damage mechanisms in electron-beam-melted Ti-6Al-4V are investigated. As-built samples exhibit a graded microstructure over the height of 120 mm, with samples from the top having larger α-laths and higher plastic strain. After HIPing, the α-lath width is greater, with reduced grain misorientation, and lower microstructural and property gradients. In both conditions, the observed cyclic softening is dominated by a monotonic reduction in the friction stress and an increase in grain misorientation, suggesting the lath structure progressively fragments into smaller grains. As-built samples show typically lower fatigue life due to crack initiation from gas pores and lack-of-fusion defects.
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Accepted/In Press date: 26 March 2022
e-pub ahead of print date: 31 March 2022
Published date: 4 April 2022
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Local EPrints ID: 489927
URI: http://eprints.soton.ac.uk/id/eprint/489927
ISSN: 0142-1123
PURE UUID: 02ed8b65-17c9-457f-99d8-655b91eea18f
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Date deposited: 07 May 2024 16:56
Last modified: 08 May 2024 02:08
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Author:
A.K. Syed
Author:
D. Parfitt
Author:
D. Wimpenny
Author:
E. Muzangaza
Author:
B. Chen
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