Effect of Overaging on Fatigue Crack Propagation and Stress Corrosion Cracking Behaviors of an Al-Zn-Mg-Cu Alloy Thick Plate

Lin, Liangwu; Liu, Zhiyi; Han, Xiangnan; Liu, Wenjuan

doi:10.1007/s11665-018-3518-0

Cited by 13 publications

(4 citation statements)

References 31 publications

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“…[18] The tip of the corrosion fatigue crack is sharp, whereas the tip of the BM and HAZ cracks demonstrates bifurcation, which indicates that the stress corrosion occurs during the corrosion fatigue crack propagation. [19][20][21] As can be observed from Figure 6, more crack deflections are present in the crack propagation paths of the BM and WM as compared with the HAZ. In the process of crack propagation, the crack deflection enhances the crack propagation resistance and critical stress required for crack propagation.…”

Section: Corrosion Fatigue Crack Propagation Pathsmentioning

confidence: 99%

Corrosion fatigue crack propagation behavior of A7N01P‐T4 aluminum alloy welded joints from high‐speed train underframe after 1.8 million km operation

Lü

Gou

et al. 2020

Materials & Corrosion

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Using the potentiodynamic polarization analysis, the fatigue crack propagation behavior of A7N01P‐T4 aluminum alloy metal inert gas welded joints cut from a high‐speed train underframe after 1.8 million km operation was studied in air and in a 3.5 wt% NaCl solution. The fracture surface and crack growth path were analyzed using optical microscopy, scanning electron microscopy, and electron backscattered diffraction. The results reveal that the corrosion fatigue crack growth rate of an A7N01P‐T4 welded joint in a 3.5 wt% NaCl solution is higher than that in air. Furthermore, the corrosion fatigue crack growth rate is noted to be the fastest in the heat‐affected zone, followed by the base metal, whereas it is the slowest in the weld metal, which is consistent with the corrosion resistance of the A7N01P‐T4 joints. The second phase is observed to exhibit a significant influence on the corrosion fatigue crack propagation path. The cracks are noted to grow toward the soft orientation and have obvious plastic deformation during the propagation process, which indicates that the anodic dissolution is the main cause of the corrosion fatigue crack growth.

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Section: Corrosion Fatigue Crack Propagation Pathsmentioning

confidence: 99%

Corrosion fatigue crack propagation behavior of A7N01P‐T4 aluminum alloy welded joints from high‐speed train underframe after 1.8 million km operation

Lü

Gou

et al. 2020

Materials & Corrosion

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“…Moreover, a bulging deformation inevitably occurs at the narrow side solidified shell induced by a reduction process [5], this deformation can lead to stress concentration near the boundary in the BTR to form internal cracks. Real internal cracks in continuous cast materials always irregularly appear [6] and are more harmful than the ideal researches in the literature [7][8] due to the stress concentration induced by their interaction effects among matrix materials [9][10].…”

Section: Introductionmentioning

confidence: 97%

Application of a chamfer slab technology to reduce internal cracks of continuous casting bloom during soft reduction process

Zong

Zhang

Wang

et al. 2019

Metall. Res. Technol.

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The stress concentrations over the brittle temperature range (BTR) in the bloom continuous casting are the main reason of internal cracks. In order to analyze the stress distribution in the BTR of the blooms during soft reduction stage, a three-dimensional thermo-mechanical finite-element model with different corner structures (i.e. chamfer angle and chamfer length) was established. The relationship between corner structures, maximum tensile stress, as well as shear stress is analyzed, and the influence of corner structure of bloom on the internal cracks is studied. The results show that the tensile stress and the shear stress decreased gradually by properly adjusting the chamfer angle and the chamfer length of the bloom. Compared with the use of the right-angle bloom casting, the application of chamfer bloom casting is able to reduce the stress concentration over the BTR, therefore reduces the internal cracks. In addition, as a side benefit, the chamfer bloom casting can save energy required in deforming the bloom during the soft reduction process.

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“…In the past decades, literatures have made abundant efforts on fatigue property and the variation of main alloying elements are proved to be an effective way to adjust fatigue property for Al-Zn-Mg-Cu alloys [8][9][10]. Besides, aging treatments are also employed frequently for improving it under a receptible strength penalty [11,12]. Previous investigations mainly focus on traditional Al-Zn-Mg-Cu alloys, however, the alloys with high zinc contents still lack enough analyses.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth and Precipitation Characteristics of a High Zn-Containing Al-Zn-Mg-Cu Alloy with Various Typical Aging States

Wen

Liu

2021

MSF

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The fatigue crack growth of Al-Zn-Mg-Cu alloy can be adjusted by different aging treatments. In the present work, a high Zn-containing Al-Zn-Mg-Cu alloy was treated by single, double and triple stage aging treatments and typical T6, T79 and T77 states were selected by tensile properties. Fatigue crack growth under these aging states was tested and related fracture morphology and precipitation characteristics were observed. The results showed that fatigue crack growth resistance for the alloy was T6<T79<T77. The corresponding fracture morphology also showed the difference of fatigue striations and the measurement of them provided an additional evidence. The precipitation proved that the alloy with T6 state possessed GPI zone, GPII zone and η' phase while that for T76 state was GPII zone, η' phase and η phase. As for the T77 state, the precipitate types were GPII zone and η' phase. The matrix precipitate for T6 state was smaller and denser than that for T79 and T77 states while that for T77 state possessed a dense distribution than that for T79 state. The measurement of precipitate size distribution also proved it. The grain boundary precipitates for T79 and T77 states were similar, which had a more intermittent distribution than that for T6 state.

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Effect of Overaging on Fatigue Crack Propagation and Stress Corrosion Cracking Behaviors of an Al-Zn-Mg-Cu Alloy Thick Plate

Cited by 13 publications

References 31 publications

Corrosion fatigue crack propagation behavior of A7N01P‐T4 aluminum alloy welded joints from high‐speed train underframe after 1.8 million km operation

Corrosion fatigue crack propagation behavior of A7N01P‐T4 aluminum alloy welded joints from high‐speed train underframe after 1.8 million km operation

Application of a chamfer slab technology to reduce internal cracks of continuous casting bloom during soft reduction process

Fatigue Crack Growth and Precipitation Characteristics of a High Zn-Containing Al-Zn-Mg-Cu Alloy with Various Typical Aging States

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