A crack-location correction for T0 analysis of an alloy 52 dissimilar metal weld

Lindqvist, Sebastian; Ahonen, Matias; Lydman, Jari; Arffman, Pentti; Hänninen, Hannu

doi:10.1016/j.engfracmech.2019.03.001

Cited by 2 publications

(1 citation statement)

References 11 publications

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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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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

Self Cite

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The effect of thermal aging on fracture properties of a narrow-gap Alloy 52 dissimilar metal weld

Lindqvist

Que

Nevasmaa

et al. 2023

Engineering Fracture Mechanics

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A crack-location correction for T0 analysis of an alloy 52 dissimilar metal weld

Cited by 2 publications

References 11 publications

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

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

The effect of thermal aging on fracture properties of a narrow-gap Alloy 52 dissimilar metal weld

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