Surface mechanical properties of 2024-T351 aluminum alloy strengthened by cryogenic laser peening

被引：0
|
作者：
Xu Y. [1 ]
Zhou J. [1 ]
Tan W. [2 ]
Meng X. [1 ]
Sheng J. [1 ]
Huang S. [1 ]
Sun Y. [1 ]
机构：
[1] School of Mechanical Engineering, Jiangsu University, Zhenjiang
[2] Changzhou Key Laboratory of Large Plastic Parts Intelligence Manufacturing, Changzhou College of Information Technology, Changzhou
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2018年 / 47卷 / 12期
关键词：
Cryogenic laser peening(CLP); Micro-hardness; Microstructure; Residual stress;
D O I：
10.3788/IRLA201847.1206002
中图分类号：
学科分类号：
摘要：
In order to investigate the effects of cryogenic laser peening (CLP) on the surface mechanical properties of 2024-T351 aluminum alloy, the Nd: YAG nanosecond pulsed laser was used to carry out the laser peening on 2024-T351 aluminum alloy at room temperature(25℃) and cryogenic temperature (-100℃), respectively. The micro-hardness, residual stress and microstructure of the samples were tested and analyzed, and the strengthening mechanism of CLP was discussed by the laser induced microstructure at room temperature and cryogenic temperature. The results show that, the dislocation density of CLP -treated samples is higher and the grain size on the surface is smaller than that of LPed after dynamic recrystallization due to the effect of cryogenic temperature on the sliding and annihilation of the dislocation. The surface micro -hardness and residual compressive stress of CLP -treated samples are respectively increased by about 20.3% and 21.6%, compared with LP samples, and the surface mechanical properties of 2024-T351 aluminum alloy are improved. © 2018, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
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