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

The Journal of Engineering

Michael E. Fitzpatrick¹  Bilal Ahmad² 

[1] Faculty of Engineering and Computing, Coventry University, Priory Street, Coventry CV1 5FB, UK;Materials Engineering, Department of Engineering and Innovation, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

关键词: surface roughness;    material hardness;    local surface displacement profiles;    welded marine steel;    weld;    component performance;    microstructure;    fatigue life;    residual stress;    parent metal;    laser shock peening;   

DOI  :  10.1049/joe.2015.0084

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

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.

【 授权许可】

CC BY