Microstructural Characterization of Alloy 52 Narrow-Gap Dissimilar Metal Weld After Aging

Sarikka, Teemu; Mouginot, Roman; Ahonen, Matias; Lindqvist, Sebastian; Ehrnstén, Ulla; Nevasmaa, Pekka; Hänninen, Hannu

doi:10.1007/978-3-030-04639-2_134

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Similarly, the LAS / Alloy 52 fusion boundary was found to be significantly affected by carbon diffusion during aging close to the operation temperature. Sarikka et al [13] reported that the hardness peak found on the weld side following PWTH tends to level out after 5 000 h and even further after 10 000 h at 400°C. They explained this evolution by the diffusion of carbon from the near-fusion-boundary region deeper into the weld metal.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical investigation of the near fusion boundary region in thermally aged 18MND5 / alloy 52 narrow-gap dissimilar metal weld

Akhatova

Robaut

Verdier

et al. 2020

Materials Science and Engineering: A

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Detailed characterization of the near fusion-boundary region of 18MND5 / Alloy 52 dissimilar metal weld joints was performed to investigate the effect of thermal aging on the microstructure and mechanical properties and to quantify the diffusion of carbon into the weld metal. It was shown that the microstructural features of dissimilar metal welds, such as the size of the partially mixed zone in the weld and the adjacency to microsegregations in the low-alloy steel have an effect on the peak carbon concentration in the enriched region of the weld. Aging conditions (time and temperature) influence the position of this concentration peak in the weld. Those trends were supported by thermodynamic calculations.

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Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical investigation of the near fusion boundary region in thermally aged 18MND5 / alloy 52 narrow-gap dissimilar metal weld

Akhatova

Robaut

Verdier

et al. 2020

Materials Science and Engineering: A

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Effect of Thermal Aging on Fracture Mechanical Properties and Crack Propagation Behavior of Alloy 52 Narrow-Gap Dissimilar Metal Weld

Ahonen¹,

Lindqvist²,

Sarikka³

et al. 2017

The Minerals, Metals &Amp; Materials Series

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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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Microstructural Characterization of Alloy 52 Narrow-Gap Dissimilar Metal Weld After Aging

Cited by 3 publications

References 15 publications

Microstructural and mechanical investigation of the near fusion boundary region in thermally aged 18MND5 / alloy 52 narrow-gap dissimilar metal weld

Microstructural and mechanical investigation of the near fusion boundary region in thermally aged 18MND5 / alloy 52 narrow-gap dissimilar metal weld

Effect of Thermal Aging on Fracture Mechanical Properties and Crack Propagation Behavior of Alloy 52 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

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