On irradiation embrittlement and recovery annealing mechanisms of Cr-Mo-V type pressure vessel steels

Risto Ilola (Corresponding Author), Vladimir Nadutov, Matti Valo, Hannu Hänninen

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Surveillance specimens of 15Kh2MFA reactor pressure vessel (RPV) steel and Sv-10KhMFT weld metal were investigated using internal friction, electrical resistivity and Mössbauer spectroscopy measurements in order to obtain information on their irradiation embrittlement and recovery annealing mechanisms. Internal friction measurements showed that carbon becomes trapped by irradiation-induced defects (fluence=4.1×1019 n/cm2, E>1 MeV, T=265 °C). During the recovery annealing (450 and 475 °C/1 h) carbon does not redissolve into the solid solution. Although irradiation usually increases the electrical resistivity of the RPV steels, in this study irradiation decreased the electrical resistivity of both the base and the weld metals. This can be due to a decrease in the dislocation density or precipitation under irradiation. The annealing temperature range for recovery was 300–600 °C for the base and the weld metals according to the electrical resistivity measurements. Some evidence of irradiation-induced carbide formation was achieved by the Mössbauer spectroscopy measurements.
Original languageEnglish
Pages (from-to)185-192
JournalJournal of Nuclear Materials
Volume302
Issue number2-3
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

embrittlement
pressure vessels
Embrittlement
Steel structures
recovery
Irradiation
steels
Annealing
Recovery
irradiation
annealing
Welds
electrical resistivity
Metals
Internal friction
internal friction
Carbon
reactors
Spectroscopy
metals

Keywords

  • reactor pressure vessel
  • reactor Pressure Vessel Embrittlement
  • reactor pressure vessel steel
  • RPV
  • pressure vessels
  • irradiation
  • irradiation embrittlement

Cite this

Ilola, Risto ; Nadutov, Vladimir ; Valo, Matti ; Hänninen, Hannu. / On irradiation embrittlement and recovery annealing mechanisms of Cr-Mo-V type pressure vessel steels. In: Journal of Nuclear Materials. 2002 ; Vol. 302, No. 2-3. pp. 185-192.
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title = "On irradiation embrittlement and recovery annealing mechanisms of Cr-Mo-V type pressure vessel steels",
abstract = "Surveillance specimens of 15Kh2MFA reactor pressure vessel (RPV) steel and Sv-10KhMFT weld metal were investigated using internal friction, electrical resistivity and M{\"o}ssbauer spectroscopy measurements in order to obtain information on their irradiation embrittlement and recovery annealing mechanisms. Internal friction measurements showed that carbon becomes trapped by irradiation-induced defects (fluence=4.1×1019 n/cm2, E>1 MeV, T=265 °C). During the recovery annealing (450 and 475 °C/1 h) carbon does not redissolve into the solid solution. Although irradiation usually increases the electrical resistivity of the RPV steels, in this study irradiation decreased the electrical resistivity of both the base and the weld metals. This can be due to a decrease in the dislocation density or precipitation under irradiation. The annealing temperature range for recovery was 300–600 °C for the base and the weld metals according to the electrical resistivity measurements. Some evidence of irradiation-induced carbide formation was achieved by the M{\"o}ssbauer spectroscopy measurements.",
keywords = "reactor pressure vessel, reactor Pressure Vessel Embrittlement, reactor pressure vessel steel, RPV, pressure vessels, irradiation, irradiation embrittlement",
author = "Risto Ilola and Vladimir Nadutov and Matti Valo and Hannu H{\"a}nninen",
year = "2002",
doi = "10.1016/S0022-3115(02)00780-8",
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pages = "185--192",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
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On irradiation embrittlement and recovery annealing mechanisms of Cr-Mo-V type pressure vessel steels. / Ilola, Risto (Corresponding Author); Nadutov, Vladimir; Valo, Matti; Hänninen, Hannu.

In: Journal of Nuclear Materials, Vol. 302, No. 2-3, 2002, p. 185-192.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - On irradiation embrittlement and recovery annealing mechanisms of Cr-Mo-V type pressure vessel steels

AU - Ilola, Risto

AU - Nadutov, Vladimir

AU - Valo, Matti

AU - Hänninen, Hannu

PY - 2002

Y1 - 2002

N2 - Surveillance specimens of 15Kh2MFA reactor pressure vessel (RPV) steel and Sv-10KhMFT weld metal were investigated using internal friction, electrical resistivity and Mössbauer spectroscopy measurements in order to obtain information on their irradiation embrittlement and recovery annealing mechanisms. Internal friction measurements showed that carbon becomes trapped by irradiation-induced defects (fluence=4.1×1019 n/cm2, E>1 MeV, T=265 °C). During the recovery annealing (450 and 475 °C/1 h) carbon does not redissolve into the solid solution. Although irradiation usually increases the electrical resistivity of the RPV steels, in this study irradiation decreased the electrical resistivity of both the base and the weld metals. This can be due to a decrease in the dislocation density or precipitation under irradiation. The annealing temperature range for recovery was 300–600 °C for the base and the weld metals according to the electrical resistivity measurements. Some evidence of irradiation-induced carbide formation was achieved by the Mössbauer spectroscopy measurements.

AB - Surveillance specimens of 15Kh2MFA reactor pressure vessel (RPV) steel and Sv-10KhMFT weld metal were investigated using internal friction, electrical resistivity and Mössbauer spectroscopy measurements in order to obtain information on their irradiation embrittlement and recovery annealing mechanisms. Internal friction measurements showed that carbon becomes trapped by irradiation-induced defects (fluence=4.1×1019 n/cm2, E>1 MeV, T=265 °C). During the recovery annealing (450 and 475 °C/1 h) carbon does not redissolve into the solid solution. Although irradiation usually increases the electrical resistivity of the RPV steels, in this study irradiation decreased the electrical resistivity of both the base and the weld metals. This can be due to a decrease in the dislocation density or precipitation under irradiation. The annealing temperature range for recovery was 300–600 °C for the base and the weld metals according to the electrical resistivity measurements. Some evidence of irradiation-induced carbide formation was achieved by the Mössbauer spectroscopy measurements.

KW - reactor pressure vessel

KW - reactor Pressure Vessel Embrittlement

KW - reactor pressure vessel steel

KW - RPV

KW - pressure vessels

KW - irradiation

KW - irradiation embrittlement

U2 - 10.1016/S0022-3115(02)00780-8

DO - 10.1016/S0022-3115(02)00780-8

M3 - Article

VL - 302

SP - 185

EP - 192

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 2-3

ER -