The University of Southampton
University of Southampton Institutional Repository

An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings

An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings
An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings
TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating–substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.
0022-2461
4390-4398
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Hakala, Timo J.
abb62f9d-6e48-49a4-9f92-2cd26a6c9518
Laukkanen, Anssi
5988005f-6ce9-4f59-a121-2949096dd73d
Ronkainen, Helena
18226205-f871-4e33-8525-5b07f7e561f3
Holmberg, Kenneth
5b359f02-8e16-4e49-99c0-ac63b4fe1ce7
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wang, Chuan Ting
80ad9adf-a9df-49ed-934d-fa64505b920d
Hakala, Timo J.
abb62f9d-6e48-49a4-9f92-2cd26a6c9518
Laukkanen, Anssi
5988005f-6ce9-4f59-a121-2949096dd73d
Ronkainen, Helena
18226205-f871-4e33-8525-5b07f7e561f3
Holmberg, Kenneth
5b359f02-8e16-4e49-99c0-ac63b4fe1ce7
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Wang, Chuan Ting, Hakala, Timo J., Laukkanen, Anssi, Ronkainen, Helena, Holmberg, Kenneth, Gao, Nong, Wood, Robert J.K. and Langdon, Terence G. (2016) An investigation into the effect of substrate on the load-bearing capacity of thin hard coatings. Journal of Materials Science, 51 (9), 4390-4398. (doi:10.1007/s10853-016-9751-8).

Record type: Article

Abstract

TiN and diamond-like carbon (DLC) coatings were deposited on Ti substrates with and without processing by high-pressure torsion (HPT). The HPT processing refined the grain size of titanium from the coarse-grained (CG) size of ~8.6 µm to the ultra-fine grained (UFG) size of ~130 nm and increased the hardness from ~1.83 to ~3.05 GPa. Scratch test results revealed that all the thin hard coatings had a higher critical load when deposited on the harder UFG Ti substrate compared to those deposited on the softer CG Ti. A three-dimensional finite element model (3D FEM) revealed that the improved load-carrying property of the thin hard coatings on the harder titanium substrates was related to the higher stresses generated within the substrate and its deformation behaviour which reduced the strain at the coating/substrate interface. A model based on the hardness of a two-layered composite was used to explain this effect, and it is shown that the model is reasonably successful in predicting the critical load of a wide range of coating–substrate systems. The analytical model and the results of the 3D FEM modelling emphasize the contribution of the substrate to the load-bearing capacity of thin coatings.

Full text not available from this repository.

More information

Accepted/In Press date: 13 January 2016
e-pub ahead of print date: 26 January 2016
Published date: May 2016
Organisations: Engineering Mats & Surface Engineerg Gp, Engineering Science Unit, nCATS Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 389726
URI: http://eprints.soton.ac.uk/id/eprint/389726
ISSN: 0022-2461
PURE UUID: ceb54302-0c52-40ca-a345-0c99b46a9347
ORCID for Robert J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 14 Mar 2016 11:45
Last modified: 17 Dec 2019 01:59

Export record

Altmetrics

Contributors

Author: Chuan Ting Wang
Author: Timo J. Hakala
Author: Anssi Laukkanen
Author: Helena Ronkainen
Author: Kenneth Holmberg
Author: Nong Gao

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×