A study on fatigue behavior of MIG-welded Al-Mg alloy with different filler-wire materials under mean stress

Gaur, Vidit; Enoki, Manabu; Okada, Toshiya; Yomogida, Syohei

doi:10.1016/j.ijfatigue.2017.11.001

Cited by 62 publications

(23 citation statements)

References 39 publications

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“…Data are plotted as broken (red dots) and unbroken (green dots) specimens only. Some popular empirical models available in literature, like Gerber's parabola, SmithWatson-Topper's model, Walker's model and the modified Walker's model proposed in [11] are also plotted in same plot and compared with each other. It appears that the modified Walker's model when combined with mean ductile fracture line predicts better the evolution of endurance limit.…”

Section: Fatigue Livesmentioning

confidence: 99%

“…The severity of sub-surface pores has also been studied numerically by many authors and it was concluded that the pores touching the surface are always more prone to initiate damage as compared to other pores [11,15]. It is already been shown that the stress concentration factor (K t ) varies with the position of pore with respect to surface.…”

Section: Figure 8: Evolution Of Fraction Of Defect-induced Crack Initmentioning

confidence: 99%

“…A modified Walker's model [11] provided the best prediction of fatigue lives and endurance limit than any of the existing models. For crack growth tests, standard CT specimens were extracted from the welded part such that the notch of the CT specimen lies along the weld bead and the crack propagation plane is same as in cylindrical specimens.…”

Section: Introductionmentioning

confidence: 97%

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Fatigue life and crack growth behavior of post welded Aluminum 5183 alloy

Gaur

Enoki

Okada³

et al. 2018

MATEC Web Conf.

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Abstract. In this study we investigated the fatigue life and crack growth behavior of Al-5183 alloy. Microscopic analysis revealed nearly equi-axed grains and no texture in longitudinal or cross-sectional plane of the welded plates. Gas porosities with an average size of 45 μm, comparable to grain size (55 μm), were present and often initiate fatigue failures. Load-controlled cyclic tests at different stress-ratios (R = -1, -0.5, 0.1, 0.5. 0.7 and 0.8) revealed decrease in fatigue lives with increase in R-ratio. At R > 0.7, no fatigue failure could be observed, suggesting a probable mean-stress saturation effect on fatigue. Mean stress also tends to control the crack initiation sites: surface initiated failures at low mean stresses while sub-surface pores induced failures at higher mean stresses. Fatigue-crack growth tests on CT specimens at different R-ratios (0.1, 0.5 and 0.8) revealed reduction in crack growth rates (and in threshold values) with increasing R-ratio. The ∆K applied for pores responsible for fatigue failures were often lower than or near to the threshold values and also, the size of such pores was of order of magnitude of grain size, thus crack initiated from pores are short cracks and further tests are progress.

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Section: Fatigue Livesmentioning

confidence: 99%

Section: Figure 8: Evolution Of Fraction Of Defect-induced Crack Initmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Fatigue life and crack growth behavior of post welded Aluminum 5183 alloy

Gaur

Enoki

Okada³

et al. 2018

MATEC Web Conf.

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“…The strain-controlled low cycle fatigue (LCF) and the stress-controlled ratcheting are the major cyclic deformation phenomena under cyclic loadings [5]. In the last several decades, extensively research works on the strain-controlled LCF behavior of welded joints have been published [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Taking the joints as bulk material, the cyclic hardening/softening features and the fatigue strength of several homogenous welded joints (with base metal of Ti6Al4V [6], 9-12% Cr steel [7][8], 7075Al alloy [9], Ni based alloy 617 [4], etc.)…”

Section: Introductionmentioning

confidence: 99%

“…and dissimilar welded joints (such as the dissimilar titanium alloy [10][11][12], the 9Cr/CrMoV steel [13], and the 2024/7075 aluminium alloy joints [14]) have been studied by many researchers. It is shown in most works that the welded joints exhibit lower fatigue strength than that of the base metal due to the heterogeneity and welding defects [15,16]. Further, in the consideration of the heterogeneity of welded joints, the strain-controlled LCF tests of the individual zones, such as the of BM, WM and HAZ materials have been carried out for different welded joints [2,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

Guo

Wang

Chen³

et al. 2019

International Journal of Mechanical Sciences

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The cyclic plasticity and the low cycle fatigue failure behavior of the weld metal (WM) and base metal (BM) of the CrNiMoV steel welded joint under the strain and stress-control modes were investigated respectively. Significant cyclic softening was observed for both the WM and BM under the low cycle fatigue tests with the two control modes. Besides, obvious ratcheting happened in the WM and BM under the stress-controlled cyclic loading conditions. It is shown that both the WM and BM exhibited lower fatigue strength at the stress control mode than that at the strain control mode due to the influence of tension-compression asymmetry. Meanwhile, the WM showed larger cyclic softening rate, lower ratchetting deformation and fatigue strength than the BM under the same loading levels. The failure location of the WM specimens shifted from BM region (nearby the heat affected zone) to the center of WM with the increasing of strain amplitude under the strain-controlled tests, which can be explained with the similar maximum equivalent plastic strain amplitude location shifting behavior observed from the corresponding finite element simulations.

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Effect of welding material on microstructure and properties of welded joints of bridge weathering steel Q345qDNH

Guo

Dong

Nan

et al. 2022

Materialwissenschaft Werkst

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The matching between the wire material and the base metal has an extremely important influence on the performance of the welded joint. In this work, the effects of two welding materials THQ440-NQ-II and ER50-6 with different compositions on the microstructure, mechanical properties and corrosion resistance of bridge weathering steel Q345qDNH were investigated. Although the mechanical properties of the two welded joints are lower than those of the base metal, the yield strength, elongation after fracture, impact toughness at 20 °C and À 40 °C of THQ440-NQ-II welded joints are 6.8 %, 23.5 %, 13.7 %, 18 % higher than those of ER50-6 welds, respectively. THQ440-NQ-II welds are ductile fractures and quasicleavage fractures at 20 °C and À 40 °C, respectively; while ER50-6 welds are quasi-cleavage fracture and cleavage fracture at 20 °C and À 40 °C, respectively, the ductile-brittle transition temperature of ER50-6 weld is higher than that of THQ440-NQ-II weld. Comparing the corrosion resistance in 3.5 % sodium chloride (NaCl) solution, THQ440-NQ-II weld is better than the base metal, while ER50-6 welds are lower than the base metal. This is because the nickel, chromium, copper elements contained in the THQ440-NQ-II welding wire can inhibit the formation of Widmanstätten structure and upper bainite during the welding process, refine the structure, increase the content of acicular ferrite, and reduce the ductilebrittle transition temperature of welding joint, improves the corrosion resistance of the weld.

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A study on fatigue behavior of MIG-welded Al-Mg alloy with different filler-wire materials under mean stress

Cited by 62 publications

References 39 publications

Fatigue life and crack growth behavior of post welded Aluminum 5183 alloy

Fatigue life and crack growth behavior of post welded Aluminum 5183 alloy

A comparative study on the cyclic plasticity and fatigue failure behavior of different subzones in CrNiMoV steel welded joint

Effect of welding material on microstructure and properties of welded joints of bridge weathering steel Q345qDNH

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