Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions

Research output: Book/ReportReportProfessional

Abstract

In the work resistivity response to annealing of weld 501 materials in various irradiationannealing-reirradiation conditions was measured by using isothermal annealing. Annealing temperature of 420°C was chosen in order to get relatively slow annealing response and to be able to follow also short time behaviour. Resistivity changes are relatively small and hence relatively much time was allocated to electronic measuring technique. Resistivity gets the response from deformation of the lattice, which in the current work originates from foreign atoms dissolved in the matrix. The irradiated materials with irradiation as the final state (-AI) show increase of resistivity by 1% after the first 5 minutes and the resistivity value remains constant up to an annealing time of 25 minutes, where after it starts to grow relatively fast. Resistivity of the annealed conditions (U, lA, IAIA) increase by 0.3% during the first 5 minutes, which may not be a real effect. Resistivity of the annealed conditions remains constant up to an annealing time of 100 minutes, where after resistivity starts to grow but clearly slower than in the irradiated conditions (-AI). This early behaviour is related to dissolution of small size copper rich precipitates (CRP). The subsequent long term increase of resistivity is assumed to be related to dissolution of larger CRPs. The irradiatedannealed condition materials have a wide size spectrum of CRPs, which allows further increase of resistivity. The long term increase of resistivity up to annealing time of 9800 minutes may be an experimental artefact, because also resistivity of the un-irradiated condition increases, which is not expected. The cause for the artefact is assumed to be the electrolytic plating of the wire contact, which oxidizes during long term annealing.
Original languageEnglish
PublisherVTT Technical Research Centre of Finland
Number of pages35
Publication statusPublished - 2015
MoE publication typeD4 Published development or research report or study

Publication series

NameResearch Report
PublisherVTT
VolumeVTT-R-00163-15

Fingerprint

electrical resistivity
irradiation
annealing
artifacts
dissolving
plating
precipitates
wire
copper
causes
matrices
electronics
atoms

Keywords

  • copper rich precipitates
  • electrical resistivity
  • irradiation-annealing-reirradiation
  • embrittlement
  • WER440 weld

Cite this

Valo, Matti ; Lappalainen, Petteri. / Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions. VTT Technical Research Centre of Finland, 2015. 35 p. (VTT Research Report, Vol. VTT-R-00163-15).
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abstract = "In the work resistivity response to annealing of weld 501 materials in various irradiationannealing-reirradiation conditions was measured by using isothermal annealing. Annealing temperature of 420°C was chosen in order to get relatively slow annealing response and to be able to follow also short time behaviour. Resistivity changes are relatively small and hence relatively much time was allocated to electronic measuring technique. Resistivity gets the response from deformation of the lattice, which in the current work originates from foreign atoms dissolved in the matrix. The irradiated materials with irradiation as the final state (-AI) show increase of resistivity by 1{\%} after the first 5 minutes and the resistivity value remains constant up to an annealing time of 25 minutes, where after it starts to grow relatively fast. Resistivity of the annealed conditions (U, lA, IAIA) increase by 0.3{\%} during the first 5 minutes, which may not be a real effect. Resistivity of the annealed conditions remains constant up to an annealing time of 100 minutes, where after resistivity starts to grow but clearly slower than in the irradiated conditions (-AI). This early behaviour is related to dissolution of small size copper rich precipitates (CRP). The subsequent long term increase of resistivity is assumed to be related to dissolution of larger CRPs. The irradiatedannealed condition materials have a wide size spectrum of CRPs, which allows further increase of resistivity. The long term increase of resistivity up to annealing time of 9800 minutes may be an experimental artefact, because also resistivity of the un-irradiated condition increases, which is not expected. The cause for the artefact is assumed to be the electrolytic plating of the wire contact, which oxidizes during long term annealing.",
keywords = "copper rich precipitates, electrical resistivity, irradiation-annealing-reirradiation, embrittlement, WER440 weld",
author = "Matti Valo and Petteri Lappalainen",
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year = "2015",
language = "English",
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}

Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions. / Valo, Matti; Lappalainen, Petteri.

VTT Technical Research Centre of Finland, 2015. 35 p. (VTT Research Report, Vol. VTT-R-00163-15).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions

AU - Valo, Matti

AU - Lappalainen, Petteri

N1 - Project code: 85628

PY - 2015

Y1 - 2015

N2 - In the work resistivity response to annealing of weld 501 materials in various irradiationannealing-reirradiation conditions was measured by using isothermal annealing. Annealing temperature of 420°C was chosen in order to get relatively slow annealing response and to be able to follow also short time behaviour. Resistivity changes are relatively small and hence relatively much time was allocated to electronic measuring technique. Resistivity gets the response from deformation of the lattice, which in the current work originates from foreign atoms dissolved in the matrix. The irradiated materials with irradiation as the final state (-AI) show increase of resistivity by 1% after the first 5 minutes and the resistivity value remains constant up to an annealing time of 25 minutes, where after it starts to grow relatively fast. Resistivity of the annealed conditions (U, lA, IAIA) increase by 0.3% during the first 5 minutes, which may not be a real effect. Resistivity of the annealed conditions remains constant up to an annealing time of 100 minutes, where after resistivity starts to grow but clearly slower than in the irradiated conditions (-AI). This early behaviour is related to dissolution of small size copper rich precipitates (CRP). The subsequent long term increase of resistivity is assumed to be related to dissolution of larger CRPs. The irradiatedannealed condition materials have a wide size spectrum of CRPs, which allows further increase of resistivity. The long term increase of resistivity up to annealing time of 9800 minutes may be an experimental artefact, because also resistivity of the un-irradiated condition increases, which is not expected. The cause for the artefact is assumed to be the electrolytic plating of the wire contact, which oxidizes during long term annealing.

AB - In the work resistivity response to annealing of weld 501 materials in various irradiationannealing-reirradiation conditions was measured by using isothermal annealing. Annealing temperature of 420°C was chosen in order to get relatively slow annealing response and to be able to follow also short time behaviour. Resistivity changes are relatively small and hence relatively much time was allocated to electronic measuring technique. Resistivity gets the response from deformation of the lattice, which in the current work originates from foreign atoms dissolved in the matrix. The irradiated materials with irradiation as the final state (-AI) show increase of resistivity by 1% after the first 5 minutes and the resistivity value remains constant up to an annealing time of 25 minutes, where after it starts to grow relatively fast. Resistivity of the annealed conditions (U, lA, IAIA) increase by 0.3% during the first 5 minutes, which may not be a real effect. Resistivity of the annealed conditions remains constant up to an annealing time of 100 minutes, where after resistivity starts to grow but clearly slower than in the irradiated conditions (-AI). This early behaviour is related to dissolution of small size copper rich precipitates (CRP). The subsequent long term increase of resistivity is assumed to be related to dissolution of larger CRPs. The irradiatedannealed condition materials have a wide size spectrum of CRPs, which allows further increase of resistivity. The long term increase of resistivity up to annealing time of 9800 minutes may be an experimental artefact, because also resistivity of the un-irradiated condition increases, which is not expected. The cause for the artefact is assumed to be the electrolytic plating of the wire contact, which oxidizes during long term annealing.

KW - copper rich precipitates

KW - electrical resistivity

KW - irradiation-annealing-reirradiation

KW - embrittlement

KW - WER440 weld

M3 - Report

T3 - Research Report

BT - Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions

PB - VTT Technical Research Centre of Finland

ER -

Valo M, Lappalainen P. Electrical resistivity response to annealing of VVER440-type weld material in irradiated, post-irradiation annealed and re-irradiated conditions. VTT Technical Research Centre of Finland, 2015. 35 p. (VTT Research Report, Vol. VTT-R-00163-15).