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Improvement on the Fatigue Performance of 2024-T4 Alloy by Synergistic Coating Technology
Materials ( IF 3.4 ) Pub Date : 2014-05-06 , DOI: 10.3390/ma7053533
Xi-Shu Wang , Xing-Wu Guo , Xu-Dong Li , Dong-Yun Ge

In this paper, rotating bending fatigue tests of 2024-T4 Al alloy with different oxide coatings were carried out. Compared to the uncoated and previously reported oxide coatings of aluminum alloys, the fatigue strength is able to be enhanced by using a novel oxide coating with sealing pore technology. These results indicate that the better the coating surface quality is, the more excellent the fatigue performance under rotating bending fatigue loading is. The improvement on the fatigue performance is mainly because the fatigue crack initiation and the early stage of fatigue crack growth at the coating layer can be delayed after PEO coating with pore sealing. Therefore, it is a so-called synergistic coating technology for various uses, including welding thermal cracks and filling micro-pores. The effects of different oxide coatings on surface hardness, compressive residual stress, morphology and fatigue fracture morphology are discussed. A critical compressive residual stress of about 95–100 MPa is proposed.

中文翻译:

协同涂层技术改善2024-T4合金的疲劳性能

本文对具有不同氧化物涂层的2024-T4铝合金进行了旋转弯曲疲劳试验。与铝合金的未涂层和先前报道的氧化物涂层相比,通过使用具有密封孔技术的新型氧化物涂层可以提高疲劳强度。这些结果表明,涂​​层表面质量越好,在旋转弯曲疲劳载荷下的疲劳性能越优异。疲劳性能的提高主要是因为在进行带孔密封的PEO涂层后,涂层的疲劳裂纹萌生和疲劳裂纹扩展的早期阶段可以被延迟。因此,这是一种用于各种用途的所谓的协同涂层技术,包括焊接热裂纹和填充微孔。讨论了不同氧化物涂层对表面硬度,压缩残余应力,形貌和疲劳断裂形貌的影响。提出了大约95–100 MPa的临界压缩残余应力。
更新日期:2014-05-06
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