Femtosecond Laser Shock Peening Residual Stress and Fatigue Life of Additive Manufactured AlSi10Mg
Femtosecond Laser Shock Peening Residual Stress and Fatigue Life of Additive Manufactured AlSi10Mg
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DOI：
10.1007/s11837-023-05820-8
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发表时间：
2023-04
期刊：
影响因子：
2.6
通讯作者：
Jacob Biddlecom;Yuxin Li;Xin Zhao;T. Berfield;G. Pataky
中科院分区：
文献类型：
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作者：
Jacob Biddlecom;Yuxin Li;Xin Zhao;T. Berfield;G. Pataky
增材制造 (AM) 合金仍然容易出现潜在的严重缺陷，例如气泡截留。这些缺陷会导致早期裂纹萌生，从而缩短疲劳寿命并增加分散性，特别是在靠近表面时。本研究研究了飞秒激光冲击喷丸 (FLSP) 对 AM AlSi10Mg 疲劳寿命的影响。由于 FLSP 的渗透性较低，处理过的样品和未处理过的样品之间的低周疲劳寿命保持一致。但同样重要的是，经 FLSP 处理的样品中的散射有所减少。从高分辨率 DIC 结果来看，与 FLSP 样品相比，未经处理的样品中每晶粒的平均应变显示出从初始加载到最终断裂的应变增加更高。尽管存在孔隙，但在增材制造材料上使用 FLSP 可以带来更一致的疲劳寿命，从而更容易进行认证并提高对其行为的信心。
Additive manufactured (AM) alloys are still prone to potentially critical flaws, such as gaseous bubble entrapment. These defects can lead to early crack initiation reducing fatigue life and increasing scatter, especially when near the surface. This research investigated the effect of femtosecond laser shock peening (FLSP) on the fatigue life of AM AlSi10Mg. Due to the low penetration of the FLSP, low cycle fatigue life remained consistent between treated and untreated specimens. Of equal importance though, the scatter was found to be reduced in the FLSP treated samples. From the high-resolution DIC results, the average strain per grain in the untreated specimens showed a higher increase of strain from initial loading to final fracture as compared to the FLSP samples. Implementing the use of FLSP onto AM materials could lead to more consistent fatigue life despite the presence of porosity, leading to a path of easier certification and improved confidence in their behavior.