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

Sebastian Lindqvist; Zaiqing Que; Pekka Nevasmaa; Noora Hytönen

doi:10.1016/j.engfracmech.2023.109056

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

Sebastian Lindqvist (Corresponding Author), Zaiqing Que, Pekka Nevasmaa, Noora Hytönen

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Abstract

In nuclear power plants, dissimilar metal welds belong to safety class 1. The effect of thermal aging at 400 °C up to 15 000 h on ductile-to-brittle transition (DBT) region was investigated for an Alloy 52 dissimilar metal weld (DMW). The cracks and the notches were placed close to the fusion boundary between the low-alloy steel (LAS) and the weld metal. In previous work for DMWs, the shifts in different DBT temperatures have not been investigated, including reference temperature T0, impact toughness-based T28J and reference temperature for arrest toughness, TKIa. The results show that the T0 reference temperature does not change significantly with aging time, only 10 °C, but the shift in T28J is 49 °C after 15 000 h. The shift in TKIa is 35 °C. The results indicate that the aging mechanism affects more the crack propagation and arrest properties than brittle fracture initiation.

Original language	English
Article number	109056
Journal	Engineering Fracture Mechanics
Volume	281
DOIs	https://doi.org/10.1016/j.engfracmech.2023.109056
Publication status	Published - 28 Mar 2023
MoE publication type	A1 Journal article-refereed

Keywords

Arrest toughness
DMW
Fracture toughness
T0
Thermal aging

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10.1016/j.engfracmech.2023.109056Licence: CC BY

j.engfracmech.2023.109056Final published version, 5.21 MBLicence: CC BY

Cite this

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

abstract = "In nuclear power plants, dissimilar metal welds belong to safety class 1. The effect of thermal aging at 400 °C up to 15 000 h on ductile-to-brittle transition (DBT) region was investigated for an Alloy 52 dissimilar metal weld (DMW). The cracks and the notches were placed close to the fusion boundary between the low-alloy steel (LAS) and the weld metal. In previous work for DMWs, the shifts in different DBT temperatures have not been investigated, including reference temperature T0, impact toughness-based T28J and reference temperature for arrest toughness, TKIa. The results show that the T0 reference temperature does not change significantly with aging time, only 10 °C, but the shift in T28J is 49 °C after 15 000 h. The shift in TKIa is 35 °C. The results indicate that the aging mechanism affects more the crack propagation and arrest properties than brittle fracture initiation.",

keywords = "Arrest toughness, DMW, Fracture toughness, T0, Thermal aging",

author = "Sebastian Lindqvist and Zaiqing Que and Pekka Nevasmaa and Noora Hyt{\"o}nen",

note = "The authors wish to express their gratitude for the funding and support from the Finnish (Teollisuuden Voima Oyj), Swedish (Ringhals AB and OKG AB) partners and VTT Technical Research Centre of Finland within the FEMMA research project.",

year = "2023",

month = mar,

day = "28",

doi = "10.1016/j.engfracmech.2023.109056",

language = "English",

volume = "281",

journal = "Engineering Fracture Mechanics",

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T1 - The effect of thermal aging on fracture properties of a narrow-gap Alloy 52 dissimilar metal weld

AU - Lindqvist, Sebastian

AU - Que, Zaiqing

AU - Nevasmaa, Pekka

AU - Hytönen, Noora

N1 - The authors wish to express their gratitude for the funding and support from the Finnish (Teollisuuden Voima Oyj), Swedish (Ringhals AB and OKG AB) partners and VTT Technical Research Centre of Finland within the FEMMA research project.

PY - 2023/3/28

Y1 - 2023/3/28

N2 - In nuclear power plants, dissimilar metal welds belong to safety class 1. The effect of thermal aging at 400 °C up to 15 000 h on ductile-to-brittle transition (DBT) region was investigated for an Alloy 52 dissimilar metal weld (DMW). The cracks and the notches were placed close to the fusion boundary between the low-alloy steel (LAS) and the weld metal. In previous work for DMWs, the shifts in different DBT temperatures have not been investigated, including reference temperature T0, impact toughness-based T28J and reference temperature for arrest toughness, TKIa. The results show that the T0 reference temperature does not change significantly with aging time, only 10 °C, but the shift in T28J is 49 °C after 15 000 h. The shift in TKIa is 35 °C. The results indicate that the aging mechanism affects more the crack propagation and arrest properties than brittle fracture initiation.

AB - In nuclear power plants, dissimilar metal welds belong to safety class 1. The effect of thermal aging at 400 °C up to 15 000 h on ductile-to-brittle transition (DBT) region was investigated for an Alloy 52 dissimilar metal weld (DMW). The cracks and the notches were placed close to the fusion boundary between the low-alloy steel (LAS) and the weld metal. In previous work for DMWs, the shifts in different DBT temperatures have not been investigated, including reference temperature T0, impact toughness-based T28J and reference temperature for arrest toughness, TKIa. The results show that the T0 reference temperature does not change significantly with aging time, only 10 °C, but the shift in T28J is 49 °C after 15 000 h. The shift in TKIa is 35 °C. The results indicate that the aging mechanism affects more the crack propagation and arrest properties than brittle fracture initiation.

KW - Arrest toughness

KW - DMW

KW - Fracture toughness

KW - T0

KW - Thermal aging

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DO - 10.1016/j.engfracmech.2023.109056

M3 - Article

SN - 0013-7944

VL - 281

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

M1 - 109056

ER -

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

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Keywords

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

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