Microstructural change of a 9Cr steel longitudinal welded tube under internal pressure creep loading

Yamada, S.; Yaguchi, Masatsugu; Ogata, Takashi

doi:10.1016/j.msea.2012.09.089

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Yamada et al investigated the 9%Cr welded joint with different creep damage levels and indicated that the MX phase was very stable in 9%Cr steel during creep or aging at 650°C. In this investigation, The EDS spectrum showed the V‐rich MX particles in Figure .…”

Section: Resultsmentioning

confidence: 99%

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Effect of Laves phase on the toughness of P92 weld metals

Wang

Liu

et al. 2018

Fatigue Fract Eng Mat Struct

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In this investigation, Laves phase was found to gradually precipitate from the tempered martensitic matrix of the two P92 weld metals (WMs) during the aging treatment. The particle size of Laves phase in the two WMs was ranged from 0.18 to 0.24 μm and was larger than the M23C6 particle size (ranged from 0.09 to 0.13 μm). The dislocation density of the two WMs was stable during aging. The hardness of the two WMs was stable during aging treatment, as the loss of solid solution strengthening was continuously compensated by the precipitation strengthening of Laves phase. The impact toughness of the two WMs declined gradually as the extending of aging time. The crack initiation zone and shear lip zone of the fracture surface were ductile fracture mode which consumed more fracture energy during impacting. The generation of Laves phase narrowed the crack initiation zone and shear lip zone and contributed to the decline of ductile fracture area percentage of aged WMs. The smaller ductile fracture area percentage contributed to the toughness reduction of aged WMs.

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Section: Resultsmentioning

confidence: 99%

“…The strengthening effect of M 23 C 6 particles on the hardness should also be illustrated from the Orowan stress (from Yamada et al), which is described as Equation .

σ_{Orowan} = 3.32 italicGb {(f_{p})}^{1 / 2} {d_{normalp}}^{- 1}

…”

Section: Resultsmentioning

confidence: 99%

Effect of Laves phase on the toughness of P92 weld metals

Wang

Liu

et al. 2018

Fatigue Fract Eng Mat Struct

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“…The authors have carried out finite element analysis to predict the thermal field and distortion with the help of weld bead geometry. Susumu Yamada et al [13] studied the longitudinally welded cylinder subjected to creep load. Using X-ray spectroscopy, they found that the creep deformation happened faster at HAZ than other locations.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of residual stresses in welded joints of cylindrical shell

Veeresh¹,

Suresh²,

S³

2022

Metall Mater Eng

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Welded cylinder structures such as pressure vessels and pipes for transportation have been applied in power stations, aerospace, and shipping industries. The study of weld-induced residual stress is vital in predicting the life of welded cylinder vessels. Depending upon the required diameter and length, they are welded by either circumferential welding or longitudinal welding. In the present work, a sequentially coupled thermal, structural analysis is carried out on circumferential and longitudinal butt weld joints of AH-36 cylinder components. The thermal field distribution and subsequent residual stresses during Gas Tungsten Arc Welding (GTAW) are studied. The moving heat source considered for analysis is based upon Goldak’s double ellipsoidal model. The weld-induced axial and hoop stresses are evaluated on both the outer and inner surfaces of the cylinder. The results for circumferential and longitudinal butt weld joints are compared. The magnitude of peak hoop and axial stresses in longitudinal butt weld joints are 45% and 95% higher than in circumferential butt weld joints. The developed analysis model, used to evaluate the thermal histories and residual stresses, is validated with experimental measurements.

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