Near-threshold fatigue crack growth behavior of 10% Cr martensitic steel welded joint with 9% Cr weld metal in high temperature air

Sun, Qixing; Li, Kejian; Li, Yong; Sheng, Rui; Cai, Zhipeng; Pan, Jiluan

doi:10.1016/j.ijfatigue.2020.105650

Cited by 18 publications

(3 citation statements)

References 36 publications

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“…To realize the smooth transition of the outer wall of the weld and the requirement of welding quality, it is necessary to design and process the welded joint of the cast steel. Figure 2 shows a typical weld geometry [10]. In the welding interface design welding slot, the inner wall has a part of the extension.…”

Section: Steel Casting Weld Of Ring Sectionmentioning

confidence: 99%

“…Oh et al [9] examined the computation model for the stress intensity factor of semi-elliptical and fully circular inner surface cracks within a residual stress field, and proposed the corresponding calculation method. On the other hand, the growth behavior of fatigue crack near-threshold under different stress ratios of a 9%-12% Cr steel welded joint was studied [10].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of crack propagation of annular butt weld and distribution of weld-induced residual stress

Zhu,

Xia,

Jin

2024

J. Phys.: Conf. Ser.

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The circumferential surface crack propagation and the effect of weld-induced residual stress were analyzed to comprehensively understand the mechanical behavior and fracture resistance of dissimilar girth welded joints of steel castings. The evaluation of stress intensity factors is conducted for circumferential cracks on internal surfaces, aiming to predict the fracture toughness of dissimilar welded joints. The distribution of weld-induced residual stress is obtained by thermal elastic-plastic finite element methods. The impact of residual stress on the propagation of cracks is investigated through the application of extended finite element theory. The high-stress intensity factors were found in such dissimilar welded joints due to the local bending and distortion caused by the asymmetrical weld geometry. The tensile residual stress and distortion were applied to the weld root area and its vicinity. Both the asymmetrical weld geometry and tensile residual stress contribute to the tensile distortion of the inner surface around the weld root, and enable the growth of internal surface cracks in the circumferential direction and radially from inside out of the welded joint. The fracture resistance decreases with the simultaneous influence of residual stress and welds’ asymmetry.

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Section: Steel Casting Weld Of Ring Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of crack propagation of annular butt weld and distribution of weld-induced residual stress

Zhu,

Xia,

Jin

2024

J. Phys.: Conf. Ser.

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“…For example, the grayscale transform method, the neighbourhood averaging method, the median lter method, and other related algorithms are researched for photo noise ltering [1,2]. Polar, threshold, grayscale centre of gravity, Hough transform, and other related algorithms are researched for weld seam stripe extraction [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Research on Weld Seam Bead Recognition Based on Convolution Neural Network

Shi

Sun

Liu

et al. 2022

Scientific Programming

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In terms of the problems of five categories of nonweld seam stripes, including inclusion, oil-spot, silk-spot, and water-spot, which interfere with weld seam recognition during robotic welding, a convolutional neural network (CNN) algorithm, combined with a multistage training strategy, is used to construct a digital model for weld seam recognition, on the basis of which the classification accuracy is compared with the standard model of seven categories of representative CNN. The results show that the ResNet model with a multistage training strategy classifies weld seams with an accuracy of 83.8%, which is superior to other standard models. In this study, the physical scenario of weld seam recognition is migrated to a neural network digital model, fulfilling the intelligent recognition of weld seams in complex scenarios based on the CNN digital model.

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Stress corrosion crack initiation and propagation before proceeding to Stage 2 for hydrostatically tested pipeline steels

Wang

Lamborn²,

Chen

2022

J Mater Sci

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Near-threshold fatigue crack growth behavior of 10% Cr martensitic steel welded joint with 9% Cr weld metal in high temperature air

Cited by 18 publications

References 36 publications

Analysis of crack propagation of annular butt weld and distribution of weld-induced residual stress

Analysis of crack propagation of annular butt weld and distribution of weld-induced residual stress

Research on Weld Seam Bead Recognition Based on Convolution Neural Network

Stress corrosion crack initiation and propagation before proceeding to Stage 2 for hydrostatically tested pipeline steels

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