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An investigation into microstructure, tribological and mechanical properties of cold sprayed Inconel 625 coatings

An investigation into microstructure, tribological and mechanical properties of cold sprayed Inconel 625 coatings
An investigation into microstructure, tribological and mechanical properties of cold sprayed Inconel 625 coatings
In this study, Inconel 625 coatings were successfully deposited on 6061 aluminum alloy using a high-pressure cold spray process. The microstructure, mechanical and tribological properties of the coatings were systematically studied. The cold sprayed Inconel 625 coatings had a low porosity level due to the severe plastic deformation of the splats. EBSD analyses revealed that grain refinement occurred within the coatings and substrates (near the substrate-coating interface), which could be attributed to strain accumulation and fragmentation process. Good adhesion strength of above 57.0 MPa was achieved between the coatings and substrates. Nano-hardness and micro-hardness values were higher than those of bulk Inconel 625 and were uniform along the thickness of the coatings. The effects of normal load and sliding velocity on the tribological properties of cold sprayed Inconel 625 coatings were investigated by sliding wear tests. The wear results demonstrated that both increased sliding velocity and normal load led to higher specific wear rates, which could result from the combined effects of tribo-film delamination, adhesive wear, abrasive wear, and thermal softening. Lower coefficients of friction of the coatings measured under 5 N compared to those measured under 2 N with the same sliding velocity could be explained by transition of wear mechanisms as well as larger coverage of tribo-film on the wear tracks.
High pressure cold spray, Inconel 625, Mechanical properties, Microstructure, Tribological properties, Wear
0257-8972
Wu, Kaiqiang
0a556f8f-8f7c-42ad-b49c-19dce848914c
Sun, Wen
38403bb0-2b99-4958-b9ee-39b4016d0968
Tan, Adrian Wei-Yee
3d644676-a520-4f41-b7f1-410d1c46689d
Marinescu, Iulian
eb6fb154-1605-451d-a446-f3148bb0da0b
Liu, Erjia
f0eb8f01-7079-4d8a-9687-f00250b31ffd
Zhou, Wei
5d4ade09-1cd3-4107-82ff-1cd9ecfdc35b
Wu, Kaiqiang
0a556f8f-8f7c-42ad-b49c-19dce848914c
Sun, Wen
38403bb0-2b99-4958-b9ee-39b4016d0968
Tan, Adrian Wei-Yee
3d644676-a520-4f41-b7f1-410d1c46689d
Marinescu, Iulian
eb6fb154-1605-451d-a446-f3148bb0da0b
Liu, Erjia
f0eb8f01-7079-4d8a-9687-f00250b31ffd
Zhou, Wei
5d4ade09-1cd3-4107-82ff-1cd9ecfdc35b

Wu, Kaiqiang, Sun, Wen, Tan, Adrian Wei-Yee, Marinescu, Iulian, Liu, Erjia and Zhou, Wei (2021) An investigation into microstructure, tribological and mechanical properties of cold sprayed Inconel 625 coatings. Surface and Coatings Technology, 424, [127660]. (doi:10.1016/j.surfcoat.2021.127660).

Record type: Article

Abstract

In this study, Inconel 625 coatings were successfully deposited on 6061 aluminum alloy using a high-pressure cold spray process. The microstructure, mechanical and tribological properties of the coatings were systematically studied. The cold sprayed Inconel 625 coatings had a low porosity level due to the severe plastic deformation of the splats. EBSD analyses revealed that grain refinement occurred within the coatings and substrates (near the substrate-coating interface), which could be attributed to strain accumulation and fragmentation process. Good adhesion strength of above 57.0 MPa was achieved between the coatings and substrates. Nano-hardness and micro-hardness values were higher than those of bulk Inconel 625 and were uniform along the thickness of the coatings. The effects of normal load and sliding velocity on the tribological properties of cold sprayed Inconel 625 coatings were investigated by sliding wear tests. The wear results demonstrated that both increased sliding velocity and normal load led to higher specific wear rates, which could result from the combined effects of tribo-film delamination, adhesive wear, abrasive wear, and thermal softening. Lower coefficients of friction of the coatings measured under 5 N compared to those measured under 2 N with the same sliding velocity could be explained by transition of wear mechanisms as well as larger coverage of tribo-film on the wear tracks.

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More information

Published date: 25 October 2021
Additional Information: Funding Information: This study is supported under the RIE2020 Industry Alignment Fund – Industry Collaboration Projects (IAF-ICP) Funding Initiative, as well as cash and in-kind contribution from Rolls-Royce Singapore Pte Ltd. Publisher Copyright: © 2021 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
Keywords: High pressure cold spray, Inconel 625, Mechanical properties, Microstructure, Tribological properties, Wear

Identifiers

Local EPrints ID: 451454
URI: http://eprints.soton.ac.uk/id/eprint/451454
ISSN: 0257-8972
PURE UUID: 30060e19-9b3c-40b6-beb7-56d507a473a7

Catalogue record

Date deposited: 29 Sep 2021 16:45
Last modified: 25 Nov 2021 18:46

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Contributors

Author: Kaiqiang Wu
Author: Wen Sun
Author: Adrian Wei-Yee Tan
Author: Iulian Marinescu
Author: Erjia Liu
Author: Wei Zhou

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