Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress

Xiaojun Shen; Pratik Shukla; Feng  Yao; Subhasisa Nath; Zhibin  An; Jonathan Lawrence

Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress

Xiaojun Shen, Pratik Shukla, Feng Yao, Subhasisa Nath, Zhibin An, Jonathan Lawrence

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Abstract

This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.

Original language	English
Pages (from-to)	137-154
Number of pages	17
Journal	International Journal of Peening Science & Technology
Volume	1
Issue number	2
Early online date	30 Nov 2018
Publication status	Published - 15 Jan 2019

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

LSP
Wettability
contact angle
Ti-674-Nb
Residual stress
SEM
3-D profiling

ASJC Scopus subject areas

Materials Science(all)

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https://www.oldcitypublishing.com/journals/ijpst-home/ijpst-issue-contents/ijpst-volume-1-issue-2-2018/ijpst-1-2-p-137-154/

Cite this

Shen, X., Shukla, P., Yao, F., Nath, S., An, Z., & Lawrence, J. (2019). Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress. International Journal of Peening Science & Technology, 1(2), 137-154. https://www.oldcitypublishing.com/journals/ijpst-home/ijpst-issue-contents/ijpst-volume-1-issue-2-2018/ijpst-1-2-p-137-154/

Shen, X, Shukla, P, Yao, F, Nath, S, An, Z & Lawrence, J 2019, 'Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress', International Journal of Peening Science & Technology, vol. 1, no. 2, pp. 137-154. <https://www.oldcitypublishing.com/journals/ijpst-home/ijpst-issue-contents/ijpst-volume-1-issue-2-2018/ijpst-1-2-p-137-154/>

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abstract = "This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.",

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author = "Xiaojun Shen and Pratik Shukla and Feng Yao and Subhasisa Nath and Zhibin An and Jonathan Lawrence",

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AU - Shen, Xiaojun

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AU - Yao, Feng

AU - Nath, Subhasisa

AU - An, Zhibin

AU - Lawrence, Jonathan

N1 - Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

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N2 - This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.

AB - This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.

KW - LSP

KW - Wettability

KW - contact angle

KW - Ti-674-Nb

KW - Residual stress

KW - SEM

KW - 3-D profiling

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Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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