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Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS
Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Water droplet erosion (WDE) protection of Ti6Al4V turbofan blades is of paramount importance to the aviation industry. A novel CrAlYN/CrN nanoscale multilayer coating deposited by the HIPIMS technique was evaluated as a potential candidate for this application. Literature suggests a strong correlation in performance ranking under WDE and cavitation erosion (CE) tests. Hence, the WDE performance of the CrAlYN/CrN coating on Ti6Al4V was investigated with an ultrasonic cavitation device. The results show excellent adhesion and superior erosion resistance of the CrAlYN/CrN coating (erosion rate lower by a factor of 14 compared to the bare Ti6Al4V substrate) and compared to coatings reported in the literature with spallation as their main erosion mechanism. Cross-sectional FIB studies revealed formation of substrate cracks underneath the coating when CE generated stresses exceeded the fatigue strength of the Ti6Al4V alloy. The interfaces of the nanoscale multilayers protected the substrate by forming an effective barrier against shock waves, delayed fatigue crack formation, deflected and arrested any cracks formed impeding the overall coating damage. The research shows that the CE resistance is influenced by the coating's texture and elastic properties, (Young's modulus). The paper discusses the erosion mechanisms of the coating and the excellent CE protection it offers.

Cavitation, HIPIMS, Nanoscale multilayers, Water droplet erosion
0925-8388
719-728
Ma, D.
ae2dcfae-cf5b-4492-b6dc-2e6b86960431
Harvey, T.J.
3b94322b-18da-4de8-b1af-56d202677e04
Wellman, R.G.
9eeab5ba-501d-46f2-bcf4-9f7e11d9bc94
Ehiasarian, A.P.
e516cffb-3efc-4808-a7ba-09de32ce5fb6
Hovsepian, P. Eh
25fdaa4c-1bd4-4239-87c2-3fb72e100de5
Sugumaran, A.A.
ebd92ec3-d9e2-4410-919f-33a1272bf72e
Purandare, Y.P.
b36dc027-6d5c-47e0-b12b-25ec749ef840
Wood, R.J.K.
dba41eaa-65e9-4d08-92b9-cd8706e42170
Ma, D.
ae2dcfae-cf5b-4492-b6dc-2e6b86960431
Harvey, T.J.
3b94322b-18da-4de8-b1af-56d202677e04
Wellman, R.G.
9eeab5ba-501d-46f2-bcf4-9f7e11d9bc94
Ehiasarian, A.P.
e516cffb-3efc-4808-a7ba-09de32ce5fb6
Hovsepian, P. Eh
25fdaa4c-1bd4-4239-87c2-3fb72e100de5
Sugumaran, A.A.
ebd92ec3-d9e2-4410-919f-33a1272bf72e
Purandare, Y.P.
b36dc027-6d5c-47e0-b12b-25ec749ef840
Wood, R.J.K.
dba41eaa-65e9-4d08-92b9-cd8706e42170

Ma, D., Harvey, T.J., Wellman, R.G., Ehiasarian, A.P., Hovsepian, P. Eh, Sugumaran, A.A., Purandare, Y.P. and Wood, R.J.K. (2019) Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS. Journal of Alloys and Compounds, 788, 719-728. (doi:10.1016/j.jallcom.2019.02.238).

Record type: Article

Abstract

Water droplet erosion (WDE) protection of Ti6Al4V turbofan blades is of paramount importance to the aviation industry. A novel CrAlYN/CrN nanoscale multilayer coating deposited by the HIPIMS technique was evaluated as a potential candidate for this application. Literature suggests a strong correlation in performance ranking under WDE and cavitation erosion (CE) tests. Hence, the WDE performance of the CrAlYN/CrN coating on Ti6Al4V was investigated with an ultrasonic cavitation device. The results show excellent adhesion and superior erosion resistance of the CrAlYN/CrN coating (erosion rate lower by a factor of 14 compared to the bare Ti6Al4V substrate) and compared to coatings reported in the literature with spallation as their main erosion mechanism. Cross-sectional FIB studies revealed formation of substrate cracks underneath the coating when CE generated stresses exceeded the fatigue strength of the Ti6Al4V alloy. The interfaces of the nanoscale multilayers protected the substrate by forming an effective barrier against shock waves, delayed fatigue crack formation, deflected and arrested any cracks formed impeding the overall coating damage. The research shows that the CE resistance is influenced by the coating's texture and elastic properties, (Young's modulus). The paper discusses the erosion mechanisms of the coating and the excellent CE protection it offers.

Text
Revised Manuscript-JALCOM-D-18-13178 (2) - Accepted Manuscript
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More information

Accepted/In Press date: 21 February 2019
e-pub ahead of print date: 26 February 2019
Published date: 5 June 2019
Keywords: Cavitation, HIPIMS, Nanoscale multilayers, Water droplet erosion

Identifiers

Local EPrints ID: 431426
URI: http://eprints.soton.ac.uk/id/eprint/431426
ISSN: 0925-8388
PURE UUID: 79f734e3-2396-49d5-83ea-fe351439d8d1

Catalogue record

Date deposited: 31 May 2019 16:30
Last modified: 07 Oct 2020 06:33

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