Effect of substrate surface condition on fatigue behavior of cold sprayed Ti6Al4V coatings
Effect of substrate surface condition on fatigue behavior of cold sprayed Ti6Al4V coatings
Ti6Al4V coatings were deposited on Ti6Al4V substrates by using a high pressure cold spray system. Before deposition, the substrate surfaces were prepared with four different surface preparation methods, namely, grinding, milling, sand blasting and water-jet cutting. The fatigue behavior of the coated specimens was studied with three point-bending-fatigue test. The fracture characteristics of the specimens were observed by using scanning electron microscopy. The surface roughness and its effect on the crack initiation and propagation in the coatings were also investigated. The results indicated that the fracture mode of the coated samples was interface cracking. At two different stress levels such as 420 and 360 MPa, the samples with the coatings deposited on the ground surfaces survived the longest fatigue life before failure, while the samples with the coatings deposited on the water-jet cut surfaces survived the shortest fatigue life. It was clearly shown that the fatigue strength of the cold sprayed Ti6Al4V coatings was strongly affected by the both spraying and substrate surface preparation conditions.
Fatigue behavior, High pressure cold spray, Surface finishing, Ti6Al4V coating, Ti6Al4V substrate
452-457
Sun, Wen
38403bb0-2b99-4958-b9ee-39b4016d0968
Tan, Adrian Wei Yee
3d644676-a520-4f41-b7f1-410d1c46689d
Khun, Nay Win
5218a552-1378-4f19-8aa9-eee5b38d939f
Marinescu, Iulian
eb6fb154-1605-451d-a446-f3148bb0da0b
Liu, Erjia
f0eb8f01-7079-4d8a-9687-f00250b31ffd
25 June 2017
Sun, Wen
38403bb0-2b99-4958-b9ee-39b4016d0968
Tan, Adrian Wei Yee
3d644676-a520-4f41-b7f1-410d1c46689d
Khun, Nay Win
5218a552-1378-4f19-8aa9-eee5b38d939f
Marinescu, Iulian
eb6fb154-1605-451d-a446-f3148bb0da0b
Liu, Erjia
f0eb8f01-7079-4d8a-9687-f00250b31ffd
Sun, Wen, Tan, Adrian Wei Yee and Liu, Erjia
,
et al.
(2017)
Effect of substrate surface condition on fatigue behavior of cold sprayed Ti6Al4V coatings.
Surface and Coatings Technology, 320 (6), .
(doi:10.1016/j.surfcoat.2016.11.093).
Abstract
Ti6Al4V coatings were deposited on Ti6Al4V substrates by using a high pressure cold spray system. Before deposition, the substrate surfaces were prepared with four different surface preparation methods, namely, grinding, milling, sand blasting and water-jet cutting. The fatigue behavior of the coated specimens was studied with three point-bending-fatigue test. The fracture characteristics of the specimens were observed by using scanning electron microscopy. The surface roughness and its effect on the crack initiation and propagation in the coatings were also investigated. The results indicated that the fracture mode of the coated samples was interface cracking. At two different stress levels such as 420 and 360 MPa, the samples with the coatings deposited on the ground surfaces survived the longest fatigue life before failure, while the samples with the coatings deposited on the water-jet cut surfaces survived the shortest fatigue life. It was clearly shown that the fatigue strength of the cold sprayed Ti6Al4V coatings was strongly affected by the both spraying and substrate surface preparation conditions.
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Accepted/In Press date: 25 November 2016
Published date: 25 June 2017
Additional Information:
Funding Information:
This work was financially supported by the National Research Foundation, Rolls-Royce, and Nanyang Technological University, Singapore, with the research grant number: NRF-RR-NTU M-RT3.1 Repair Technologies: Metal Cold Spray. Authors also thanked the Rolls-Royce team members Anna Tai and Nicholas Weeks for their contributions to this work.
Publisher Copyright:
© 2016 Elsevier B.V.
Keywords:
Fatigue behavior, High pressure cold spray, Surface finishing, Ti6Al4V coating, Ti6Al4V substrate
Identifiers
Local EPrints ID: 475803
URI: http://eprints.soton.ac.uk/id/eprint/475803
ISSN: 0257-8972
PURE UUID: fc3c91aa-76a8-4a0c-ba44-adcbae5694f3
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Date deposited: 28 Mar 2023 18:25
Last modified: 17 Mar 2024 13:14
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Contributors
Author:
Wen Sun
Author:
Adrian Wei Yee Tan
Author:
Nay Win Khun
Author:
Iulian Marinescu
Author:
Erjia Liu
Corporate Author: et al.
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