Hydrogen environment assisted cracking in X70 welding heat-affected zone under a high-pressure hydrogen gas

Nguyen, Thanh Tuan; Beak, Un Bong; Park, Jaeyeong; Nahm, Seung Hoon; Tak, Naehyung

doi:10.1016/j.tafmec.2020.102746

Cited by 13 publications

(1 citation statement)

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“…This temperature variation also leads to heterogeneous expansion and contraction along the cross-section of the weldment. The interaction between the welding thermal cycle and the metal lattices of the materials may cause a drastic change in the microstructural characteristics of the materials in the subregion of a weld joint, which induces microstructure variations in the heat-affected zone (HAZ) [22][23][24]. While the temperature at the region in the core zone of the welding pool is still high, the nonuniform contraction of the material at a lower temperature region near the outer surface may generate tensile/compressive stresses: so-called RS at the outer surface region and in the interior of the weldment, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on Mode-I Stress Intensity Factor: A Quantitative Evaluation and a Suggestion of an Estimating Equation

Nguyen

Pham

Tran

et al. 2023

Metals

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An extensive literature review was conducted primarily to develop a comprehensive understanding of the quantitative behavior of residual stress (RS) distribution in weld joints. Based on prior data, various levels of the peak RS and distribution profiles were applied to a finite element analyses (FEA) model as an initial loading to evaluate the effect of RS on the Mode-I stress intensity factor (SIF), KI. The RS was not found to have a significant effect on the SIF values when the peak RS was less than 300 MPa. The enhanced effect of RS on the KI values was found to be more pronounced at a lower crack ratio, while the analytical form of the RS distribution had a minor effect. The effective boundary corrections function, FResidual, was derived under the effect of RS for 1T CT specimen for various crack geometries of the crack ratio, (a/W) of 0.2, 0.40, 0.50, 0.60, and 0.75, and with peak RS varying from 100 MPa to 600 MPa. The obtained effective function of KI can be employed to quantitatively evaluate the effect of RS on the fatigue performance of welded joints.

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Section: Introductionmentioning

confidence: 99%