Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals

Matias Ahonen, Ulla Ehrnsten, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

Nickel-based alloys are susceptible to a form of hydrogen embrittlement, Low Temperature Crack Propagation (LTCP), which can cause severe degradation of the fracture resistance of nickel-based alloys. LTCP may occur in low temperature water, with the highest susceptibility reported at about 55 C, with high stress and slow loading rate in pre-cracked Ni-based materials. Although LTCP has not been reported in commercial reactors, the susceptibility of different alloys is important to establish. As a part of the Finnish Reactor Safety Program, SAFIR 2010, the effect of hydrogenated Pressurized Water Reactor, PWR, primary water on the LTCP susceptibility of nickel-based weld metals of Alloy 182, 82, 152 and 52 was studied performing J-R-tests at a slow displacement rate in simulated low temperature PWR primary water. The results revealed that Alloy 182 is the most susceptible nickel-based weld metal to LTCP. Pure weld metal specimens were substantially more susceptible to LTCP than the dissimilar metal weld specimens. Pre-exposure to high temperature hydrogenated water did not affect remarkably the fracture toughness of any of the test materials.
Original languageEnglish
Title of host publicationBaltica VIII
Subtitle of host publicationLife Management and Maintenance for Power Plants
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages372-383
Volume1
ISBN (Electronic)978-951-38-7592-3
ISBN (Print)978-951-38-7591-6
Publication statusPublished - 2010
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 18 May 201020 May 2010

Publication series

NameVTT Symposium
PublisherVTT
Number264
ISSN (Print)0357–9387
ISSN (Electronic)1455–0873

Conference

ConferenceBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period18/05/1020/05/10

Fingerprint

Fracture toughness
Welds
Nickel
Crack propagation
Metals
Water
Temperature
Dissimilar metals
Hydrogen embrittlement
Pressurized water reactors
Degradation

Cite this

Ahonen, M., Ehrnsten, U., & Hänninen, H. (2010). Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. In Baltica VIII: Life Management and Maintenance for Power Plants (Vol. 1, pp. 372-383). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 264
Ahonen, Matias ; Ehrnsten, Ulla ; Hänninen, Hannu. / Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1 Espoo : VTT Technical Research Centre of Finland, 2010. pp. 372-383 (VTT Symposium; No. 264).
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abstract = "Nickel-based alloys are susceptible to a form of hydrogen embrittlement, Low Temperature Crack Propagation (LTCP), which can cause severe degradation of the fracture resistance of nickel-based alloys. LTCP may occur in low temperature water, with the highest susceptibility reported at about 55 C, with high stress and slow loading rate in pre-cracked Ni-based materials. Although LTCP has not been reported in commercial reactors, the susceptibility of different alloys is important to establish. As a part of the Finnish Reactor Safety Program, SAFIR 2010, the effect of hydrogenated Pressurized Water Reactor, PWR, primary water on the LTCP susceptibility of nickel-based weld metals of Alloy 182, 82, 152 and 52 was studied performing J-R-tests at a slow displacement rate in simulated low temperature PWR primary water. The results revealed that Alloy 182 is the most susceptible nickel-based weld metal to LTCP. Pure weld metal specimens were substantially more susceptible to LTCP than the dissimilar metal weld specimens. Pre-exposure to high temperature hydrogenated water did not affect remarkably the fracture toughness of any of the test materials.",
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Ahonen, M, Ehrnsten, U & Hänninen, H 2010, Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. in Baltica VIII: Life Management and Maintenance for Power Plants. vol. 1, VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 264, pp. 372-383, BALTICA VIII - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 18/05/10.

Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. / Ahonen, Matias; Ehrnsten, Ulla; Hänninen, Hannu.

Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1 Espoo : VTT Technical Research Centre of Finland, 2010. p. 372-383 (VTT Symposium; No. 264).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals

AU - Ahonen, Matias

AU - Ehrnsten, Ulla

AU - Hänninen, Hannu

N1 - Project code: 41755

PY - 2010

Y1 - 2010

N2 - Nickel-based alloys are susceptible to a form of hydrogen embrittlement, Low Temperature Crack Propagation (LTCP), which can cause severe degradation of the fracture resistance of nickel-based alloys. LTCP may occur in low temperature water, with the highest susceptibility reported at about 55 C, with high stress and slow loading rate in pre-cracked Ni-based materials. Although LTCP has not been reported in commercial reactors, the susceptibility of different alloys is important to establish. As a part of the Finnish Reactor Safety Program, SAFIR 2010, the effect of hydrogenated Pressurized Water Reactor, PWR, primary water on the LTCP susceptibility of nickel-based weld metals of Alloy 182, 82, 152 and 52 was studied performing J-R-tests at a slow displacement rate in simulated low temperature PWR primary water. The results revealed that Alloy 182 is the most susceptible nickel-based weld metal to LTCP. Pure weld metal specimens were substantially more susceptible to LTCP than the dissimilar metal weld specimens. Pre-exposure to high temperature hydrogenated water did not affect remarkably the fracture toughness of any of the test materials.

AB - Nickel-based alloys are susceptible to a form of hydrogen embrittlement, Low Temperature Crack Propagation (LTCP), which can cause severe degradation of the fracture resistance of nickel-based alloys. LTCP may occur in low temperature water, with the highest susceptibility reported at about 55 C, with high stress and slow loading rate in pre-cracked Ni-based materials. Although LTCP has not been reported in commercial reactors, the susceptibility of different alloys is important to establish. As a part of the Finnish Reactor Safety Program, SAFIR 2010, the effect of hydrogenated Pressurized Water Reactor, PWR, primary water on the LTCP susceptibility of nickel-based weld metals of Alloy 182, 82, 152 and 52 was studied performing J-R-tests at a slow displacement rate in simulated low temperature PWR primary water. The results revealed that Alloy 182 is the most susceptible nickel-based weld metal to LTCP. Pure weld metal specimens were substantially more susceptible to LTCP than the dissimilar metal weld specimens. Pre-exposure to high temperature hydrogenated water did not affect remarkably the fracture toughness of any of the test materials.

M3 - Conference article in proceedings

SN - 978-951-38-7591-6

VL - 1

T3 - VTT Symposium

SP - 372

EP - 383

BT - Baltica VIII

PB - VTT Technical Research Centre of Finland

CY - Espoo

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Ahonen M, Ehrnsten U, Hänninen H. Effect of hydrogenated low temperature water on fracture toughness of nickel based weld metals. In Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 1. Espoo: VTT Technical Research Centre of Finland. 2010. p. 372-383. (VTT Symposium; No. 264).