Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C

Roman Mouginot, Teemu Sarikka, Ulla Ehrnstén, Young Suk Kim, Sung Soo Kim, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Alloy 690 is used in critical components of nuclear power systems. It has a high intergranular stress corrosion cracking (IGSCC) resistance, but questions remain concerning its long-term primary water stress corrosion cracking (PWSCC) resistance during the service life of pressurized water reactor (PWR) components. To study the effect of thermal ageing, four conditions of Alloy 690 (solution annealed, coldrolled and/or heat-treated) were aged at 420, 475 and 550 °C for 10 000 h and characterized by SEM, EBSD and nanoindentation. Thermal ageing of Alloy 690 triggered intergranular (IG) carbide precipitation and all conditions showed evidence of short-range ordering (SRO), with the start of a disordering reaction at 475 °C. Prior heat treatment induced ordering prior to thermal ageing, as compared to water-quenched specimens. IG carbide precipitation increased with increasing ageing temperature, as well as diffusioninduced grain boundary migration (DIGM).
Original languageEnglish
Title of host publicationBaltica X
Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
EditorsPertti Auerkari
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages8
ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
Duration: 7 Jun 20169 Jun 2016

Publication series

NameVTT Technology
PublisherVTT
Volume261
ISSN (Electronic)2242-122X

Conference

ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
Abbreviated titleBaltica X
CountryFinland
CityHelsinki-Stockholm
Period7/06/169/06/16

Fingerprint

Thermal aging
Stress corrosion cracking
Carbides
Pressurized water reactors
Nanoindentation
Service life
Nuclear energy
Water
Grain boundaries
Aging of materials
Heat treatment
Scanning electron microscopy
Temperature

Keywords

  • Alloy 690
  • thermal ageing
  • short-range ordering
  • Ni2Cr
  • carbide precipitation
  • heat treatment
  • cold work

Cite this

Mouginot, R., Sarikka, T., Ehrnstén, U., Kim, Y. S., Kim, S. S., & Hänninen, H. (2016). Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants Espoo: VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261
Mouginot, Roman ; Sarikka, Teemu ; Ehrnstén, Ulla ; Kim, Young Suk ; Kim, Sung Soo ; Hänninen, Hannu. / Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. Baltica X: International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).
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title = "Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C",
abstract = "Alloy 690 is used in critical components of nuclear power systems. It has a high intergranular stress corrosion cracking (IGSCC) resistance, but questions remain concerning its long-term primary water stress corrosion cracking (PWSCC) resistance during the service life of pressurized water reactor (PWR) components. To study the effect of thermal ageing, four conditions of Alloy 690 (solution annealed, coldrolled and/or heat-treated) were aged at 420, 475 and 550 °C for 10 000 h and characterized by SEM, EBSD and nanoindentation. Thermal ageing of Alloy 690 triggered intergranular (IG) carbide precipitation and all conditions showed evidence of short-range ordering (SRO), with the start of a disordering reaction at 475 °C. Prior heat treatment induced ordering prior to thermal ageing, as compared to water-quenched specimens. IG carbide precipitation increased with increasing ageing temperature, as well as diffusioninduced grain boundary migration (DIGM).",
keywords = "Alloy 690, thermal ageing, short-range ordering, Ni2Cr, carbide precipitation, heat treatment, cold work",
author = "Roman Mouginot and Teemu Sarikka and Ulla Ehrnst{\'e}n and Kim, {Young Suk} and Kim, {Sung Soo} and Hannu H{\"a}nninen",
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publisher = "VTT Technical Research Centre of Finland",
editor = "Pertti Auerkari",
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Mouginot, R, Sarikka, T, Ehrnstén, U, Kim, YS, Kim, SS & Hänninen, H 2016, Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. in P Auerkari (ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, vol. 261, BALTICA X - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 7/06/16.

Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. / Mouginot, Roman; Sarikka, Teemu; Ehrnstén, Ulla; Kim, Young Suk; Kim, Sung Soo; Hänninen, Hannu.

Baltica X: International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari. Espoo : VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C

AU - Mouginot, Roman

AU - Sarikka, Teemu

AU - Ehrnstén, Ulla

AU - Kim, Young Suk

AU - Kim, Sung Soo

AU - Hänninen, Hannu

PY - 2016

Y1 - 2016

N2 - Alloy 690 is used in critical components of nuclear power systems. It has a high intergranular stress corrosion cracking (IGSCC) resistance, but questions remain concerning its long-term primary water stress corrosion cracking (PWSCC) resistance during the service life of pressurized water reactor (PWR) components. To study the effect of thermal ageing, four conditions of Alloy 690 (solution annealed, coldrolled and/or heat-treated) were aged at 420, 475 and 550 °C for 10 000 h and characterized by SEM, EBSD and nanoindentation. Thermal ageing of Alloy 690 triggered intergranular (IG) carbide precipitation and all conditions showed evidence of short-range ordering (SRO), with the start of a disordering reaction at 475 °C. Prior heat treatment induced ordering prior to thermal ageing, as compared to water-quenched specimens. IG carbide precipitation increased with increasing ageing temperature, as well as diffusioninduced grain boundary migration (DIGM).

AB - Alloy 690 is used in critical components of nuclear power systems. It has a high intergranular stress corrosion cracking (IGSCC) resistance, but questions remain concerning its long-term primary water stress corrosion cracking (PWSCC) resistance during the service life of pressurized water reactor (PWR) components. To study the effect of thermal ageing, four conditions of Alloy 690 (solution annealed, coldrolled and/or heat-treated) were aged at 420, 475 and 550 °C for 10 000 h and characterized by SEM, EBSD and nanoindentation. Thermal ageing of Alloy 690 triggered intergranular (IG) carbide precipitation and all conditions showed evidence of short-range ordering (SRO), with the start of a disordering reaction at 475 °C. Prior heat treatment induced ordering prior to thermal ageing, as compared to water-quenched specimens. IG carbide precipitation increased with increasing ageing temperature, as well as diffusioninduced grain boundary migration (DIGM).

KW - Alloy 690

KW - thermal ageing

KW - short-range ordering

KW - Ni2Cr

KW - carbide precipitation

KW - heat treatment

KW - cold work

M3 - Conference article in proceedings

T3 - VTT Technology

BT - Baltica X

A2 - Auerkari, Pertti

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Mouginot R, Sarikka T, Ehrnstén U, Kim YS, Kim SS, Hänninen H. Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. In Auerkari P, editor, Baltica X: International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2016. (VTT Technology, Vol. 261).