Improvement on the Fatigue Performance of 2024-T4 Alloy by Synergistic Coating Technology

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 technolog...

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Bibliographic Details
Published in:Materials 2014-05, Vol.7 (5), p.3533-3546
Main Authors: Wang, Xi-Shu, Guo, Xing-Wu, Li, Xu-Dong, Ge, Dong-Yun
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Bending fatigue
Coating effects
Compressive properties
Crack initiation
Crack propagation
Fatigue cracks
Fatigue failure
Fatigue strength
Fatigue tests
Fracture mechanics
Morphology
Oxide coatings
Residual stress
Rotation
Sealing
Surface hardness
Surface properties
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma7053533