Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering

Sebastian Lindqvist; Noora Hytönen; Laura Sirkiä; Pentti Arffman; Jari Lydman; Yanling Ge; Pekka Nevasmaa; Zaiqing Que

doi:10.1115/PVP2022-80690

Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering

Sebastian Lindqvist, Noora Hytönen, Laura Sirkiä, Pentti Arffman, Jari Lydman, Yanling Ge, Pekka Nevasmaa, Zaiqing Que

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

Abstract

The fracture toughness in the ductile-to-brittle transition region is determined for the heat-affected zone (HAZ) adjacent to the fusion boundary between a low alloy steel (LAS) and the weld metal of narrow-gap Alloy 52 dissimilar metal weld (DMW) after 15 000 h of thermal aging at 400 °C and of an Alloy 52 DMW with buttering in reference condition. The fracture toughness testing is done according to ASTM E1921, and fractography and cross-section metallography are applied to characterize the crack paths, crack locations and fracture type. The T0 transition temperature for the DMW with buttering is −117 °C, indicating marginally higher toughness compared to the narrow-gap DMW. The cracks close to the fusion boundary (approximately 200 μm) in both DMWs deviate from the HAZ towards the fusion boundary. The thermal aging treatment of the narrow-gap Alloy 52 DMW does not significantly affect the fracture toughness properties of the fusion boundary. Further research is needed to better understand the lower boundary fracture toughness behavior at approximately 300 μm from the fusion boundary. The results contribute to long-term operation assessment of nuclear power plants, and development of analysis and characterization methods for DMWs related to the effect of crack path and location.

Original language	English
Title of host publication	ASME 2022 Pressure Vessels and Piping Conference
Publisher	American Society of Mechanical Engineers (ASME)
Pages	PVP2022-80690
Number of pages	7
Volume	4A
ISBN (Electronic)	978-0-7918-8617-5
DOIs	https://doi.org/10.1115/PVP2022-80690
Publication status	Published - 4 Nov 2022
MoE publication type	A4 Article in a conference publication
Event	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 - Las Vegas, United States Duration: 17 Jul 2022 → 22 Jul 2022

Conference

Conference	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022
Country/Territory	United States
City	Las Vegas
Period	17/07/22 → 22/07/22

Keywords

alloys
brittleness
fracture
metals
fracture toughness
alloy steel
ASTM International
fractography
heat
metallography
nuclear power stations
phase transition temperature
testing

Access to Document

10.1115/PVP2022-80690

Cite this

Lindqvist, S., Hytönen, N., Sirkiä, L., Arffman, P., Lydman, J., Ge, Y., Nevasmaa, P., & Que, Z. (2022). Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering. In ASME 2022 Pressure Vessels and Piping Conference (Vol. 4A, pp. PVP2022-80690). [V04AT06A040] American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2022-80690

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title = "Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering",

abstract = "The fracture toughness in the ductile-to-brittle transition region is determined for the heat-affected zone (HAZ) adjacent to the fusion boundary between a low alloy steel (LAS) and the weld metal of narrow-gap Alloy 52 dissimilar metal weld (DMW) after 15 000 h of thermal aging at 400 °C and of an Alloy 52 DMW with buttering in reference condition. The fracture toughness testing is done according to ASTM E1921, and fractography and cross-section metallography are applied to characterize the crack paths, crack locations and fracture type. The T0 transition temperature for the DMW with buttering is −117 °C, indicating marginally higher toughness compared to the narrow-gap DMW. The cracks close to the fusion boundary (approximately 200 μm) in both DMWs deviate from the HAZ towards the fusion boundary. The thermal aging treatment of the narrow-gap Alloy 52 DMW does not significantly affect the fracture toughness properties of the fusion boundary. Further research is needed to better understand the lower boundary fracture toughness behavior at approximately 300 μm from the fusion boundary. The results contribute to long-term operation assessment of nuclear power plants, and development of analysis and characterization methods for DMWs related to the effect of crack path and location.",

keywords = "alloys, brittleness, fracture, metals, fracture toughness, alloy steel, ASTM International, fractography, heat, metallography, nuclear power stations, phase transition temperature, testing",

author = "Sebastian Lindqvist and Noora Hyt{\"o}nen and Laura Sirki{\"a} and Pentti Arffman and Jari Lydman and Yanling Ge and Pekka Nevasmaa and Zaiqing Que",

note = "Funding Information: 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. The authors would like to thank P. Efsing, B. Forssgren, P. Rautala, H. Reinvall and H. H{\"a}nninen for the suggestions and contributions. Publisher Copyright: {\textcopyright} 2022 American Society of Mechanical Engineers (ASME). All rights reserved.; ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 ; Conference date: 17-07-2022 Through 22-07-2022",

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doi = "10.1115/PVP2022-80690",

language = "English",

volume = "4A",

pages = "PVP2022--80690",

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Lindqvist, S , Hytönen, N , Sirkiä, L , Arffman, P , Lydman, J, Ge, Y, Nevasmaa, P & Que, Z 2022, Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering. in ASME 2022 Pressure Vessels and Piping Conference. vol. 4A, V04AT06A040, American Society of Mechanical Engineers (ASME), pp. PVP2022-80690, ASME 2022 Pressure Vessels and Piping Conference, PVP 2022, Las Vegas, United States, 17/07/22. https://doi.org/10.1115/PVP2022-80690

Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering. / Lindqvist, Sebastian ; Hytönen, Noora ; Sirkiä, Laura et al.

ASME 2022 Pressure Vessels and Piping Conference. Vol. 4A American Society of Mechanical Engineers (ASME), 2022. p. PVP2022-80690 V04AT06A040.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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AU - Sirkiä, Laura

AU - Arffman, Pentti

AU - Lydman, Jari

AU - Ge, Yanling

AU - Nevasmaa, Pekka

AU - Que, Zaiqing

N1 - Funding Information: 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. The authors would like to thank P. Efsing, B. Forssgren, P. Rautala, H. Reinvall and H. Hänninen for the suggestions and contributions. Publisher Copyright: © 2022 American Society of Mechanical Engineers (ASME). All rights reserved.

PY - 2022/11/4

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N2 - The fracture toughness in the ductile-to-brittle transition region is determined for the heat-affected zone (HAZ) adjacent to the fusion boundary between a low alloy steel (LAS) and the weld metal of narrow-gap Alloy 52 dissimilar metal weld (DMW) after 15 000 h of thermal aging at 400 °C and of an Alloy 52 DMW with buttering in reference condition. The fracture toughness testing is done according to ASTM E1921, and fractography and cross-section metallography are applied to characterize the crack paths, crack locations and fracture type. The T0 transition temperature for the DMW with buttering is −117 °C, indicating marginally higher toughness compared to the narrow-gap DMW. The cracks close to the fusion boundary (approximately 200 μm) in both DMWs deviate from the HAZ towards the fusion boundary. The thermal aging treatment of the narrow-gap Alloy 52 DMW does not significantly affect the fracture toughness properties of the fusion boundary. Further research is needed to better understand the lower boundary fracture toughness behavior at approximately 300 μm from the fusion boundary. The results contribute to long-term operation assessment of nuclear power plants, and development of analysis and characterization methods for DMWs related to the effect of crack path and location.

AB - The fracture toughness in the ductile-to-brittle transition region is determined for the heat-affected zone (HAZ) adjacent to the fusion boundary between a low alloy steel (LAS) and the weld metal of narrow-gap Alloy 52 dissimilar metal weld (DMW) after 15 000 h of thermal aging at 400 °C and of an Alloy 52 DMW with buttering in reference condition. The fracture toughness testing is done according to ASTM E1921, and fractography and cross-section metallography are applied to characterize the crack paths, crack locations and fracture type. The T0 transition temperature for the DMW with buttering is −117 °C, indicating marginally higher toughness compared to the narrow-gap DMW. The cracks close to the fusion boundary (approximately 200 μm) in both DMWs deviate from the HAZ towards the fusion boundary. The thermal aging treatment of the narrow-gap Alloy 52 DMW does not significantly affect the fracture toughness properties of the fusion boundary. Further research is needed to better understand the lower boundary fracture toughness behavior at approximately 300 μm from the fusion boundary. The results contribute to long-term operation assessment of nuclear power plants, and development of analysis and characterization methods for DMWs related to the effect of crack path and location.

KW - alloys

KW - brittleness

KW - fracture

KW - metals

KW - fracture toughness

KW - alloy steel

KW - ASTM International

KW - fractography

KW - heat

KW - metallography

KW - nuclear power stations

KW - phase transition temperature

KW - testing

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M3 - Conference article in proceedings

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SP - PVP2022-80690

BT - ASME 2022 Pressure Vessels and Piping Conference

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME 2022 Pressure Vessels and Piping Conference, PVP 2022

Y2 - 17 July 2022 through 22 July 2022

ER -

Lindqvist S , Hytönen N , Sirkiä L , Arffman P , Lydman J, Ge Y et al. Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering. In ASME 2022 Pressure Vessels and Piping Conference. Vol. 4A. American Society of Mechanical Engineers (ASME). 2022. p. PVP2022-80690. V04AT06A040 doi: 10.1115/PVP2022-80690

Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering

Abstract

Conference

Keywords

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Fracture in the Ductile-To-Brittle Transition Region of A Narrow-Gap Alloy 52 and Alloy 52 Dissimilar Metal Weld With Buttering

Abstract

Conference

Keywords

Access to Document

Other files and links

Fingerprint

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FEMMa: Future Electrified Mobile Machines

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