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Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Train
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上海工程技術(shù)大學

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TG456.7

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國家自然科學基金項目（面上項目，重點項目，重大項目）


Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Train
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Shanghai University of Engineering Science

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    摘要:

    The fatigue property of Al-5Zn-2Mg aluminum alloy Metal-Inert Gas (MIG) welding joints used in high-speed train are studied by fatigue machine. Scanning electron microscopy (SEM) is used to observe the fatigue fracture and the surface damage. Results shows that uniaxial ratcheting behavior take place in the welding zone (WZ) when the stress is higher than 0.5σb. There is obvious plastic deformation in the WZ and a lot of slip band on the surface, which reduces the fatigue life of the sample. The uniaxial ratcheting behavior take place mainly in the first cycle and the finally failure stage of the fatigue process. When the stress is lower than 0.5σb, the fatigue samples crack in the heat affected zone (HAZ). The fatigue fracture of the WZ and the fusion zone (FZ) is typical ductile fracture pattern while that of the HAZ and the base metal (BM) is quasi-cleavage fracture. The fatigue life of the BM is much longer than the HAZ.

    Abstract:

    The fatigue property of Al-5Zn-2Mg aluminum alloy Metal-Inert Gas (MIG) welding joints used in high-speed train are studied by fatigue machine. Scanning electron microscopy (SEM) is used to observe the fatigue fracture and the surface damage. Results shows that uniaxial ratcheting behavior take place in the welding zone (WZ) when the stress is higher than 0.5σb. There is obvious plastic deformation in the WZ and a lot of slip band on the surface, which reduces the fatigue life of the sample. The uniaxial ratcheting behavior take place mainly in the first cycle and the finally failure stage of the fatigue process. When the stress is lower than 0.5σb, the fatigue samples crack in the heat affected zone (HAZ). The fatigue fracture of the WZ and the fusion zone (FZ) is typical ductile fracture pattern while that of the HAZ and the base metal (BM) is quasi-cleavage fracture. The fatigue life of the BM is much longer than the HAZ.

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倪維源. Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Train[J].稀有金屬材料與工程,2016,45(11):2774~2778.[niweiyuan. Fatigue Property of Al-5Zn-2Mg Aluminum Alloy Welding Joints Used in High-speed Train[J]. Rare Metal Materials and Engineering,2016,45(11):2774~2778.]
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  • 收稿日期:2014-08-07
  • 最后修改日期:2014-09-02
  • 錄用日期:2014-11-10
  • 在線發(fā)布日期: 2016-12-08
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