Ab'/> The influence of laser surface treatment on the fatigue crack growth of AA 2024-T3 aluminum alloy alclad sheet
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The influence of laser surface treatment on the fatigue crack growth of AA 2024-T3 aluminum alloy alclad sheet

机译：激光表面处理对AA 2024-T3铝合金Alclad板疲劳裂纹生长的影响

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AbstractThe purpose of this work is to study the effect of local heating using the laser heating process as a surface treatment to retard the crack propagation of an aluminum alloy. The heating process was applied over an aerospace grade aluminum alloy AA2024-T3 alclad sheet with 1.6mm thickness. One and two heating lines were applied by a defocused Yb:fiber laser beam that generated a laser spot diameter of 2mm, with laser speeds between 1 and 50mm/s. For crack propagation tests, modified C(T) specimens were manufactured and tested according to ASTM E647. A layer of carbon black was applied over the surface of some specimens previously to the laser heating process. The obtained results shown that the fatigue crack growth was reduced using specific parameters for the laser heating process.Highlights?The use of Yb:fiber laser for localized surface heating on AA2024 is proposed.?Fatigue crack growth testing shows retardation effect and fatigue life increase.?Laser heating lines induce compressive residual stresses.?Hardness and microstructure may be affected by heating process.]]>
机译：<！[cdata [ 抽象 本作作品的目的是使用激光加热过程来研究本地加热作为表面处理的影响延迟铝合金的裂纹繁殖。将加热过程施加在带有1.6mm厚度的航空级铝合金AA2024-T3 ALCLAD板上。通过散焦的Yb：光纤激光束施加一个和两个加热管线，其产生激光光斑直径为2mm，激光速度在1到50mm / s之间。对于裂纹繁殖试验，根据ASTM E647制造和测试改性的C（T）样本。以前施加一层炭黑以前以激光加热过程施加在一些样本的表面上。所得结果表明，使用激光加热过程的特定参数减少了疲劳裂纹生长。 亮点 < CE：简单段ID =“SP0055”查看=“全部”> ？ 提出了YB：光纤激光器用于AA2024上的局部表面加热。 ？ 疲劳裂纹增长测试显示延迟效果和疲劳寿命增加。 ？ 激光加热系诱导压缩残余应力es。 ？ 硬度和微观结构可能受加热过程的影响。 ]]>

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