The effect of laser shock peening on hardness and microstructure in a welded marine steel

Bilal Ahmad; Michael E. Fitzpatrick

The effect of laser shock peening on hardness and microstructure in a welded marine steel

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Author(s): Bilal Ahmad¹ and Michael E. Fitzpatrick²
- Affiliations: 1: Materials Engineering , Department of Engineering and Innovation , The Open University , Walton Hall , Milton Keynes , MK7 6AA , UK ;
  2: Faculty of Engineering and Computing , Coventry University , Priory Street , Coventry CV1 5FB , UK
Source: Volume 2015, Issue 13, May 2015, p. 115 – 125
DOI: 10.1049/joe.2015.0084 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)

Received 10/05/2015, Accepted 12/05/2015, Published 30/06/2015

Residual stress is generally considered as the main criterion in laser shock peening for enhancement of fatigue life. However, changes in material hardness, microstructure and surface roughness can also affect component performance. These three aspects are investigated in this paper for welded marine steel samples subjected to laser peening. After laser peening an increase in hardness was seen across the weld and parent metal, with the local hardness dependent upon the initial hardness of the region before peening. The increase was relatively higher for the weld metal which had lower initial hardness. The local surface displacement profiles reflected the number of laser peening layers applied, and the peening also affected the distortion of the specimen after welding.

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The effect of laser shock peening on hardness and microstructure in a welded marine steel

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