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Metals 2016, 6(11), 292;

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
School of Mechanical and Electrical Engineering, Xuzhou Institute of Technology, Xuzhou 221111, China
Author to whom correspondence should be addressed.
Academic Editor: Patrice Peyre
Received: 12 September 2016 / Revised: 11 November 2016 / Accepted: 17 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Laser Shock Processing on Metal)
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The aim of this paper is to study the effects of laser peening (LP) on the residual stress distribution and microstructure evolution of AA 6061-T6 under different temperatures. A laser peening experiment was conducted on the square-shape samples by using single spot and 50% overlap shock. Three-dimensional surface morphologies of treated samples were observed. The influence of peening temperature on the distribution of compressive residual stress was analyzed. An optical microscope (OM) and a transmission electron microscope (TEM) were employed to observe the microstructure evolution of the samples before and after LP. The results indicate that, as the peening temperature increases, the micro-hardness increases first and then decreases. The LP process induces high-amplitude compressive residual stress on the surface at different temperatures even if the compressive residual stress slightly reduces with increases in temperature. The maximum compressive residual stress affected layer depth is about 0.67 mm, appearing at a temperature of 160 °C. The OM test revealed that the grain size was significantly decreased after warm laser peening (WLP) and that the average value of grain size was reduced by 50%. The TEM test shows that more dislocation tangles were produced in AA 6061-T6 after WLP; compared to the LP process, the precipitate-dislocation interaction can benefit both strength and ductility for AA 6061-T6, thus enhancing the mechanical properties of the material. View Full-Text
Keywords: AA 6061-T6; laser peening; temperature; surface integrity; microstructure AA 6061-T6; laser peening; temperature; surface integrity; microstructure

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Huang, S.; Wang, Z.; Sheng, J.; Agyenim-Boateng, E.; Liu, M.; Yang, X.; Zhou, J. Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening. Metals 2016, 6, 292.

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