Microstructure and Tensile Properties of Laser Deposition Repair GH738 Superalloy

Hongyou, 卞宏友 Bian; Quanxing, 翟泉星 Zhai; Ying, 李英 Li; Guang, 杨光 Yang; Wei, 王伟 Wang

doi:10.3788/cjl201744.1002003

Cited by 2 publications

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“…The specific operation is to immerse the area to be expanded in the composite phosphate completion fluid for 12 h. According to the standard GB 6398‐2017 test method, the precorroded specimen is installed on the electrohydraulic servo tension torsion fatigue machine, and the crack opening displacement gauge extensometer (which can detect the output crack length, stress intensity factor, and other parameters in real time) is installed. After the precrack parameters are determined, the precrack of the CT specimen is carried out 45,46 . On the basis of the precracked specimens, determine each group of fatigue crack growth test parameters and carry out the fatigue crack growth test (Figure 7).…”

Section: Fatigue Crack Growth Analysis Methodologymentioning

confidence: 99%

“…After the precrack parameters are determined, the precrack of the CT specimen is carried out. 45,46 On the basis of the precracked specimens, determine each group of fatigue crack growth test parameters and carry out the fatigue crack growth test (Figure 7). In this test, the test is completed when the fatigue crack length reaches 35…”

Section: ) Experimental Parametersmentioning

confidence: 99%

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Investigation on fatigue crack propagation failure mechanism of hydraulic lifting pipe in deep‐ocean natural gas hydrate exploitation

Liang,

Guo,

Chen

et al. 2024

Energy Science & Engineering

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In deep‐ocean natural gas hydrate exploitation operation, the fatigue failure mechanism has attracted more and more attention from scholars, but it has not been effectively disclosed. Therefore, in this work, a multifield coupling and multiple‐nonlinear vibration model of lifting pipe is established, which can accurately determine the alternating stress of deep‐ocean lifting pipe. Second, according to Forman theory, the calculation method of crack propagation length and depth on the surface of a deep‐water riser is established, which is verified by the comparison between the experimental and theoretical model calculation results. The results demonstrate that, first, the effect of residual stress in the welded joint of deep‐ocean lifting pipe should be considered in the later parameter influence analysis. Second, the fatigue growth life of deep‐water pipe with small outflow velocity is mainly determined by tensile stress, and that is determined by both tensile stress and bending stress with large outflow velocity. Third, more attention should be paid to the vibration of the lower pipe on‐site to reduce its vibration frequency and vibration stress amplitude, which can effectively reduce the surface crack propagation state of the deep‐ocean pipe and improve the service life of the pipe. Fourth, properly adjusting the tension coefficient of the tensioner during field operation can effectively improve the safety of the pipe, and the optimal tension coefficient is related to the configuration of the deep‐ocean pipe system, which can be analyzed and determined by the model.

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Section: Fatigue Crack Growth Analysis Methodologymentioning

confidence: 99%

Section: ) Experimental Parametersmentioning

confidence: 99%