Microstructure evolution and hardness distribution of linear friction welded AA5052-H34 joint and AA5083-O joint

Choi, Jeong-Won; Li, Weihao; Ushioda, Kohsaku; Yamamoto, Mikio; Fujii, Hidetoshi

doi:10.1016/j.jmrt.2022.02.003

Cited by 13 publications

(11 citation statements)

References 27 publications

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“…The significant ferrite dendritic structures have formed perpendicular to the FZ, which can extend into the welded seam representing the direction of maximum heat flow 15 . It had been concluded in earlier studies that the coarse grains in the FZ were formed due to dynamic recrystallization during welding 32 . The transition region clearly demonstrates the transformation of grain morphology.…”

Section: Resultsmentioning

confidence: 86%

“…In this regard, the dislocation density on the HAZ side of the fusion line is higher than that on the FZ side. Moreover, this also may be explained by the higher dislocation consumption in the welded seam near the FZ due to the higher temperature distribution during the welding process 32 . The high localized strain is distributed around the grain boundaries, which implies the dislocations inside the grains of the FZ move toward the grain boundaries during the recrystallization process, thus plugging at the grain boundaries and generating high strain accumulations.…”

Section: Resultsmentioning

confidence: 99%

“…15 It had been concluded in earlier studies that the coarse grains in the FZ were formed due to dynamic recrystallization during welding. 32 The transition region clearly demonstrates the transformation of grain morphology. The presence of many fine grains around the elongation and coarse grains can be observed in Figure 8C,D.…”

Section: Microstructurementioning

confidence: 97%

“…15 It should be noted that the FZ has a lower LAGBs fraction in Figure 8E,F than the Near-HAZ and transition region of HAZ-FZ. Choi et al 32 suggested that the reduction in the LAGB fraction in the FZ that resulted could be attributed to dynamic recrystallization.…”

Section: Ebsd Characterizationmentioning

confidence: 99%

“…Since the temperature of the HAZ is lower than that of the FZ side during the welding process, dislocation annihilation is suppressed, resulting in an increase in the fractions of LAGBs. 32 Grain orientation spread (GOS) indicates the lattice distortion strength. A higher GOS value means more severe lattice distortion and higher dislocation density, while grains with low GOS values have a uniform strain distribution.…”

Section: Ebsd Characterizationmentioning

confidence: 99%

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Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Cong

Liu

Huang

et al. 2022

Fatigue Fract Eng Mat Struct

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The microstructural evolution and mechanical properties of welded joints for Q450NQR1 and Q450AWR5 alloys were investigated. The inhomogeneous microstructures of Q450NQR1 and Q450AWR5 welded joints can result in heterogeneous mechanical responses. Microhardness distributions of the two welded joints are not uniform with the highest hardness value in the FZ, followed by the HAZ, and the lowest hardness value in the BM. The tensile strength of Q450AWR5 welded joints is slightly higher than the Q450NQR1 welded joints. The tensile fracture occurred in the BM of both welded joints, probably due to the strengthening effect of bainite with high dislocation density and lattice distortion. The fatigue life is dominated by the welded defects inside the welded joint. The location of fatigue failure occurs mainly near the fusion zone and is limited by the welded defects, independent of the microstructure.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 97%

Section: Ebsd Characterizationmentioning

confidence: 99%

Section: Ebsd Characterizationmentioning

confidence: 99%

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