The effect of crack path on tearing resistance of a narrow-gap Alloy 52 dissimilar metal weld

Lindqvist, Sebastian; Sarikka, Teemu; Ahonen, Matias; Hänninen, Hannu

doi:10.1016/j.engfracmech.2018.05.043

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…For the effect of the material constraints, the J-resistance curves [5][6][7][8][9][10], crack growth paths [11,12], fracture toughness [13][14][15], and stress and strain fields at crack tip [16][17][18][19][20] under different material constraints have been widely studied. Wang et al [5,6] studied the J-resistance curves of a dissimilar metal welded joint at different crack positions with different material constraints.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [12] investigated the effects of material constraint induced by welded mechanical heterogeneity on the interface crack propagation in dissimilar weld joints. Lindqvist et al [13] studied the fracture toughness of specimens with different material constraints. Kumar et al [14] studied the fracture toughness properties of dissimilar metal weld joints between SA508Gr.3 Cl.1 and SA312 Type 304LN pipe.…”

Section: Introductionmentioning

confidence: 99%

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Effect Range of the Material Constraint-II. Interface Crack

Dai

Yang

Wang

2019

Metals

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The selection of fracture behaviors used in the structure integrity assessment has significant implications on the accuracy of the assessment. The effect range of the material constraint is an important factor which effects the fracture behaviors of structures and exists in the different kinds of welded joints with the center crack. However, for the material constraint induced by an interface crack, which also appears widely in the welded joints, it is not clear whether the effect range exists or not. The further study of the effect range of the material constraint for the welded joints with interface crack is meaningful. Thus, in this study, different basic models with interface crack were designed, the fracture behaviors of these basic models under different material constraints were calculated, and the effect range of the material constraint induced by interface crack were studied. This study about the interface crack and the previous study about the center crack provide an additional basis for an accurate structure integrity assessment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect Range of the Material Constraint-II. Interface Crack

Dai

Yang

Wang

2019

Metals

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“…The thermal ageing at 400 • C for 5000 and 10,000 h is therefore considered to be slightly beneficial in the case of the RPV safe-end Alloy 52 narrow-gap DMW, when considering the performance of the DMW in the operation environment (high-temperature PWR water), as it reduces the strength mismatch at the weld interface. It has been shown that thermal ageing has a detrimental effect on impact toughness of the narrow-gap DMW LAS HAZ, but the ductile-to-brittle transition temperature after thermal ageing remains low enough to ensure the safe operation and shut-down of the power plant [37][38][39][40].…”

Section: Niwel Hv It (15 Mn) Location Distance Of Peak Hardness Frommentioning

confidence: 99%

Effect of Thermal Ageing at 400 °C on the Microstructure of Ferrite-Austenite Interface of Nickel-Base Alloy Narrow-Gap Dissimilar Metal Weld

Ahonen

Mouginot

Sarikka

et al. 2020

Metals

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Dissimilar metal welds (DMWs) are a key design feature in nuclear power systems, typically involving ferritic low-alloy steels (LAS), stainless steels (SS), and nickel-base alloys. They are, however, a potential concern regarding the structural integrity of nuclear power systems. In particular, the LAS/nickel-base alloy weld metal interface is known to develop a local strength mismatch upon post-weld heat treatment (PWHT). Very limited data is available on the effect of thermal ageing on the DMW interface. The aim of this study was to investigate the effects of thermal ageing at 400 °C for up to 10,000 h on a narrow-gap DMW mock-up representative of the weld between the reactor pressure vessel nozzle and its safe-end after PWHT, with a special focus on the LAS SA 508/nickel-base Alloy 52 weld metal interface. No significant effect of thermal ageing on the appearing microstructure was observed in either LAS base material, LAS heat-affected zone or Alloy 52 weld metal. However, thermal ageing reduced the local strength mismatch at the LAS/nickel-base weld metal interface formed during PWHT. The reduction of the strength mismatch was detected using nanoindentation measurements and was concluded to be associated with a decrease in the carbon pile-up in the weld metal caused by PWHT. Based on the obtained results, thermal ageing promotes carbon diffusion from the weld metal side of the fusion boundary further away into the weld metal and thus slightly decreases the local strength mismatch.

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“…Samal et al [14] and Yang et al [15] studied the deviation of crack propagation path in DMWJ influenced by material constraint. Lindqvist et al [16] and Jang et al [17] focused on their studies on the fracture toughness of DMWJ affected by material constraint. Xue et al [18] and Zhu et al [19] studied the crack-tip fields of DMWJ influenced by material constraint.…”

Section: Introductionmentioning

confidence: 99%

Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

2020

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Different strength mismatched laboratory specimens that contain the compact tension (CT), single edge-notched tensile (SENT), and central-cracked tension (CCT) specimens with various specimen geometries, loading configurations, and initial cracks were selected to investigate the effect range of the material constraint systematically. The results showed that the effect range of material constraint exists in all the strength mismatched specimens and structures. The numerical value of the effect range is influenced by the geometry constraint. The high geometry constraint reduces the effect range of material constraint. When a material is located outside the effect range of material constraint, the fracture resistance curves and crack propagation paths of the specimens and structures are no longer influenced by the mechanical properties of the material. In addition, an interaction exists between the geometry constraint and material constraint. The high geometry constraint strengthens the effect of material constraint, whereas the fracture resistance curve and crack propagation path are insensitive to the material constraint under the low geometry constraint. The results in this study may provide scientific support for the structure integrity assessment and the design of strength mismatched structures.

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The effect of crack path on tearing resistance of a narrow-gap Alloy 52 dissimilar metal weld

Cited by 10 publications

References 15 publications

Effect Range of the Material Constraint-II. Interface Crack

Effect Range of the Material Constraint-II. Interface Crack

Effect of Thermal Ageing at 400 °C on the Microstructure of Ferrite-Austenite Interface of Nickel-Base Alloy Narrow-Gap Dissimilar Metal Weld

Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

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