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Materials 2016, 9(10), 799; doi:10.3390/ma9100799

Improvement in Fatigue Performance of Aluminium Alloy Welded Joints by Laser Shock Peening in a Dynamic Strain Aging Temperature Regime

1
School of Mechnical Engineering, Jiangsu University, Zhenjiang 212013, China
2
School of Mechanical & Vehicle Engineering, Changzhou Institute of Technology, Changzhou 213000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hsiung-Cheng Lin
Received: 20 August 2016 / Revised: 11 September 2016 / Accepted: 22 September 2016 / Published: 26 September 2016
(This article belongs to the Special Issue Selected Papers from IS3C2016)
View Full-Text   |   Download PDF [6061 KB, uploaded 26 September 2016]   |  

Abstract

As a new treatment process after welding, the process parameters of laser shock peening (LSP) in dynamic strain aging (DSA) temperature regimes can be precisely controlled, and the process is a non-contact one. The effects of LSP at elevated temperatures on the distribution of the surface residual stress of AA6061-T6 welded joints were investigated by using X-ray diffraction technology with the sin2ϕ method and Abaqus software. The fatigue life of the welded joints was estimated by performing tensile fatigue tests. The microstructural evolution in surface and fatigue fractures of the welded joints was presented by means of surface integrity and fracture surface testing. In the DSA temperature regime of AA6061-T6 welded joints, the residual compressive stress was distributed more stably than that of LSP at room temperature. The thermal corrosion resistance and fatigue properties of the welded joints were also improved. The experimental results and numerical analysis were in mutual agreement. View Full-Text
Keywords: laser shock peening; AA6061-T6 welded joint; dynamic strain aging; residual stress; high-cycle fatigue; fracture laser shock peening; AA6061-T6 welded joint; dynamic strain aging; residual stress; high-cycle fatigue; fracture
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Su, C.; Zhou, J.; Meng, X.; Huang, S. Improvement in Fatigue Performance of Aluminium Alloy Welded Joints by Laser Shock Peening in a Dynamic Strain Aging Temperature Regime. Materials 2016, 9, 799.

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