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The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography

[Display omitted] •The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hard...

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Published in:International journal of fatigue 2019-08, Vol.125, p.210-221
Main Authors: Wu, S.C., Song, Z., Kang, G.Z., Hu, Y.N., Fu, Y.N.
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Language:English
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cited_by cdi_FETCH-LOGICAL-c409t-faafed8cce3f0addc4e058cab683ad9c0c0a14c5f473ac1e40c3d8cabe7bfa963
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container_title International journal of fatigue
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creator Wu, S.C.
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description [Display omitted] •The microstructure feature of hybrid laser welded AA7050 joints were investigated.•The softening is significant in the FQZ of fusion welded joints.•The defects remarkably reduce the fatigue performance of fusion welded joints.•The fatigue strength can be estimated by means of hardness and defect size.•The defect tolerance range was defined by Kitagawa-Takahashi diagram. The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. Modified Murakami equation and Kitagawa-Takahashi diagram were finally established to correlate the fatigue strength with defects, which provides an important reference to assess the joints.
doi_str_mv 10.1016/j.ijfatigue.2019.04.002
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The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. 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The relationship between the microstructural nature and fatigue resistance was explored for laser welded AA7050-T7451. Based on high-resolution synchrotron radiation X-ray micro computed tomography, it is found that the large surface defects are a controlling factor in fatigue crack initiation. Besides, fine equiaxed grain zone (FQZ) near the fusion line appears to the failure site of hybrid laser welded joints. Particularly for gas pores-free at the weld surface, such FQZ might play a crucial role in degrading the service strength. Research results show that the evolution in microstructure, element and defects due to welding deteriorates the hardness, tensile strength and fatigue properties. 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source ScienceDirect Journals
subjects Aluminum base alloys
Computed tomography
Crack initiation
Crack propagation
Crystal defects
Defects
Fatigue crack initiation and growth
Fatigue failure
Fatigue life
Fatigue strength
Fracture mechanics
Heat treating
Kitagawa-Takahashi diagram
Laser beam welding
Laser hybrid welding
Materials fatigue
Microstructure
Murakami equation
Railway vehicle components
S N diagrams
Surface defects
Synchrotron radiation
Tomography
Welded joints
title The Kitagawa-Takahashi fatigue diagram to hybrid welded AA7050 joints via synchrotron X-ray tomography
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