Effect of shot peening using ultra-fine particles on fatigue properties of 5056 aluminum alloy under rotating bending

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:652

Article

Kikuchi, Shoichi¹  Nakamura, Yuki²  Nambu, Koichiro³  Ando, Masafumi⁴ 

[1] Kobe Univ, Grad Sch Engn, Dept Mech Engn, Nada Ku, 1-1 Rokkodai Cho, Kobe, Hyogo 6578501, Japan

[2] Toyota Coll, Natl Inst Technol, Dept Mech Engn, 2-1 Eisei Cho, Toyota, Aichi 4718525, Japan

[3] Suzuka Coll, Dept Mech Engn, Natl Inst Technol, Shiroko Cho, Suzuka, Mie 5100294, Japan

[4] IKK SHOT Co Ltd, Innovat Team, 412-4 Nunowari,Minami Shibata Machi, Tokai, Aichi 4760001, Japan

关键词: Shot peening;    Fine particle peening;    Fatigue;    Aluminum alloy;    Residual stress;    Hardness;   

DOI  :  10.1016/j.msea.2015.11.076

来源: Elsevier

【 摘 要 】

Shot peening using particles 10 mu m in diameter (ultra-fine particle peening: Ultra-FPP) was introduced to improve the fatigue properties of 5056 aluminum alloy. The surface microstructures of the Ultra-FPP treated specimens were characterized using a micro-Vickers hardness tester, scanning electron microscopy (SEM), X-ray diffraction (XRD), non-contact scanning white light interferometry, and electron backscatter diffraction (EBSD). The Ultra-FPP treated specimen had higher hardness than the conventional FPP treated specimen with a short nozzle distance due to the high velocity of the ultra-fine particles. Furthermore, the surface hardness of the Ultra-FPP treated specimen tended to increase as the peening time decreased. Fatigue tests were performed in air at room temperature using a cantilever-type rotating bending fatigue testing machine. It was found that the fatigue life of the Ultra-FPP treated specimen tended to increase with decreasing peening time. Mainly, the Ultra-FPP improved the fatigue properties of 5056 aluminum alloy in the very high cycle regime of more than 10(7) cycles compared with the un-peened specimens. This is because the release of the compressive residual stress is small during fatigue tests at low stress amplitudes. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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