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Metals 2016, 6(6), 126; doi:10.3390/met6060126

Effects of Warm Laser Peening on Thermal Stability and High Temperature Mechanical Properties of A356 Alloy

1
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
2
College of mechanical and Electronic Engineering, Ji’an College, Ji’an 343000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Patrice Peyre
Received: 29 February 2016 / Revised: 20 April 2016 / Accepted: 25 April 2016 / Published: 24 May 2016
(This article belongs to the Special Issue Laser Shock Processing on Metal)
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Abstract

To study the effects of warm laser peening (WLP) on the thermal stability and mechanical properties of A356 alloy, the samples were treated by WLP using a Nd:YAG solid-state laser and temperature control device. The residual stress, micro-hardness and microstructures of samples treated by WLP were observed. The result shows that the temperature significantly affects the strengthening effect of laser peening (LP). The residual stress induced by WLP decreases with the increasing temperature. The micro-hardness and dislocation density increase first, and then decrease with the increases of temperature. The grain refinement degree of the samples treated by WLP is much higher than that of LP. In addition, after aging for 100 min at 220 °C, the samples treated by LP and WLP were comparatively investigated in thermal stability. Obviously, the residual compressive stress, micro-hardness and microstructure induced by WLP present a better thermal stability property than that of LP. The residual stress and micro-hardness of WLP samples are obviously improved, and the increasing degrees are 23.31% and 19.70%, respectively. The dislocation density remains at a high level, while the grains are still in fine crystalline state. View Full-Text
Keywords: warm laser peening; A356 alloy; residual stress; micro-hardness; mechanical property warm laser peening; A356 alloy; residual stress; micro-hardness; mechanical property
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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Chen, H.; Zhou, J.; Sheng, J.; Meng, X.; Huang, S.; Xie, X. Effects of Warm Laser Peening on Thermal Stability and High Temperature Mechanical Properties of A356 Alloy. Metals 2016, 6, 126.

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