Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing

Roman Mouginot, Teemu Sarikka, Mikko Heikkilä, Mykola Ivanchenko, Unto Tapper, Ulla Ehrnstén, Hannu Hänninen

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

Abstract

Thermal ageing promotes intergranular carbide precipitation and atomic ordering reaction in most commercial nickel-base alloys, and it affects the long-term primary water stress corrosion cracking (PWSCC) resistance of pressurized water reactor components. Alloy 690 with 9.8 wt% Fe was solution annealed and heat-treated at low temperature, then aged between 350 and 550 °C for 10,000 h. No direct observation of ordering was possible, but variations in hardness and lattice parameter suggested the formation of short-range ordering (SRO) with a peak level upon ageing at 420 °C, while a disordering reaction occurred at higher temperatures. Heat treatment induced ordering before thermal ageing was compared to the solution-annealed state. Thermal ageing resulted in the precipitation of Cr-rich M23C6 carbides at grain boundaries and twin boundaries. Although no link between SRO and an increase in strain localization was observed, the combination of intergranular carbide formation and SRO over longer ageing times was deemed detrimental to the PWSCC resistance of Alloy 690 TT.
Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
EditorsDenise Paraventi, Michael Wright, John H. Jackson
PublisherSpringer
Pages321-334
Number of pages14
ISBN (Print)978-3-319-67243-4, 978-3-319-67244-1
DOIs
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
Event18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States
Duration: 13 Aug 201717 Aug 2017

Publication series

NameMinerals, Metals and Materials Series
VolumePart F9
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
Abbreviated titleEDM 2017
CountryUnited States
CityPortland
Period13/08/1717/08/17

Fingerprint

Thermal aging
Carbides
Stress corrosion cracking
Aging of materials
Water
Pressurized water reactors
Nickel
Lattice constants
Grain boundaries
Hardness
Heat treatment
Temperature

Keywords

  • alloy 690
  • thermal ageing
  • short-range ordering
  • Ni2Cr
  • cold work
  • thermal treatment
  • Ni Cr

Cite this

Mouginot, R., Sarikka, T., Heikkilä, M., Ivanchenko, M., Tapper, U., Ehrnstén, U., & Hänninen, H. (2018). Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing. In D. Paraventi, M. Wright, & J. H. Jackson (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (pp. 321-334). Springer. Minerals, Metals and Materials Series, Vol.. Part F9 https://doi.org/10.1007/978-3-319-67244-1_21
Mouginot, Roman ; Sarikka, Teemu ; Heikkilä, Mikko ; Ivanchenko, Mykola ; Tapper, Unto ; Ehrnstén, Ulla ; Hänninen, Hannu. / Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing. Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. editor / Denise Paraventi ; Michael Wright ; John H. Jackson. Springer, 2018. pp. 321-334 (Minerals, Metals and Materials Series, Vol. Part F9).
@inproceedings{268ac43d5765412b9fe527c214435e20,
title = "Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing",
abstract = "Thermal ageing promotes intergranular carbide precipitation and atomic ordering reaction in most commercial nickel-base alloys, and it affects the long-term primary water stress corrosion cracking (PWSCC) resistance of pressurized water reactor components. Alloy 690 with 9.8 wt{\%} Fe was solution annealed and heat-treated at low temperature, then aged between 350 and 550 °C for 10,000 h. No direct observation of ordering was possible, but variations in hardness and lattice parameter suggested the formation of short-range ordering (SRO) with a peak level upon ageing at 420 °C, while a disordering reaction occurred at higher temperatures. Heat treatment induced ordering before thermal ageing was compared to the solution-annealed state. Thermal ageing resulted in the precipitation of Cr-rich M23C6 carbides at grain boundaries and twin boundaries. Although no link between SRO and an increase in strain localization was observed, the combination of intergranular carbide formation and SRO over longer ageing times was deemed detrimental to the PWSCC resistance of Alloy 690 TT.",
keywords = "alloy 690, thermal ageing, short-range ordering, Ni2Cr, cold work, thermal treatment, Ni Cr",
author = "Roman Mouginot and Teemu Sarikka and Mikko Heikkil{\"a} and Mykola Ivanchenko and Unto Tapper and Ulla Ehrnst{\'e}n and Hannu H{\"a}nninen",
note = "SDA: SHP: SASUNE Nuclear",
year = "2018",
month = "1",
day = "1",
doi = "10.1007/978-3-319-67244-1_21",
language = "English",
isbn = "978-3-319-67243-4",
series = "Minerals, Metals and Materials Series",
publisher = "Springer",
pages = "321--334",
editor = "Denise Paraventi and Michael Wright and Jackson, {John H.}",
booktitle = "Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors",
address = "Germany",

}

Mouginot, R, Sarikka, T, Heikkilä, M, Ivanchenko, M, Tapper, U, Ehrnstén, U & Hänninen, H 2018, Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing. in D Paraventi, M Wright & JH Jackson (eds), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Springer, Minerals, Metals and Materials Series, vol. Part F9, pp. 321-334, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Portland, United States, 13/08/17. https://doi.org/10.1007/978-3-319-67244-1_21

Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing. / Mouginot, Roman; Sarikka, Teemu; Heikkilä, Mikko; Ivanchenko, Mykola; Tapper, Unto; Ehrnstén, Ulla; Hänninen, Hannu.

Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. ed. / Denise Paraventi; Michael Wright; John H. Jackson. Springer, 2018. p. 321-334 (Minerals, Metals and Materials Series, Vol. Part F9).

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

TY - GEN

T1 - Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing

AU - Mouginot, Roman

AU - Sarikka, Teemu

AU - Heikkilä, Mikko

AU - Ivanchenko, Mykola

AU - Tapper, Unto

AU - Ehrnstén, Ulla

AU - Hänninen, Hannu

N1 - SDA: SHP: SASUNE Nuclear

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Thermal ageing promotes intergranular carbide precipitation and atomic ordering reaction in most commercial nickel-base alloys, and it affects the long-term primary water stress corrosion cracking (PWSCC) resistance of pressurized water reactor components. Alloy 690 with 9.8 wt% Fe was solution annealed and heat-treated at low temperature, then aged between 350 and 550 °C for 10,000 h. No direct observation of ordering was possible, but variations in hardness and lattice parameter suggested the formation of short-range ordering (SRO) with a peak level upon ageing at 420 °C, while a disordering reaction occurred at higher temperatures. Heat treatment induced ordering before thermal ageing was compared to the solution-annealed state. Thermal ageing resulted in the precipitation of Cr-rich M23C6 carbides at grain boundaries and twin boundaries. Although no link between SRO and an increase in strain localization was observed, the combination of intergranular carbide formation and SRO over longer ageing times was deemed detrimental to the PWSCC resistance of Alloy 690 TT.

AB - Thermal ageing promotes intergranular carbide precipitation and atomic ordering reaction in most commercial nickel-base alloys, and it affects the long-term primary water stress corrosion cracking (PWSCC) resistance of pressurized water reactor components. Alloy 690 with 9.8 wt% Fe was solution annealed and heat-treated at low temperature, then aged between 350 and 550 °C for 10,000 h. No direct observation of ordering was possible, but variations in hardness and lattice parameter suggested the formation of short-range ordering (SRO) with a peak level upon ageing at 420 °C, while a disordering reaction occurred at higher temperatures. Heat treatment induced ordering before thermal ageing was compared to the solution-annealed state. Thermal ageing resulted in the precipitation of Cr-rich M23C6 carbides at grain boundaries and twin boundaries. Although no link between SRO and an increase in strain localization was observed, the combination of intergranular carbide formation and SRO over longer ageing times was deemed detrimental to the PWSCC resistance of Alloy 690 TT.

KW - alloy 690

KW - thermal ageing

KW - short-range ordering

KW - Ni2Cr

KW - cold work

KW - thermal treatment

KW - Ni Cr

UR - http://www.scopus.com/inward/record.url?scp=85042516368&partnerID=8YFLogxK

U2 - 10.1007/978-3-319-67244-1_21

DO - 10.1007/978-3-319-67244-1_21

M3 - Conference article in proceedings

SN - 978-3-319-67243-4

SN - 978-3-319-67244-1

T3 - Minerals, Metals and Materials Series

SP - 321

EP - 334

BT - Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors

A2 - Paraventi, Denise

A2 - Wright, Michael

A2 - Jackson, John H.

PB - Springer

ER -

Mouginot R, Sarikka T, Heikkilä M, Ivanchenko M, Tapper U, Ehrnstén U et al. Development of short-range order and intergranular carbide precipitation in Alloy 690 TT upon thermal ageing. In Paraventi D, Wright M, Jackson JH, editors, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Springer. 2018. p. 321-334. (Minerals, Metals and Materials Series, Vol. Part F9). https://doi.org/10.1007/978-3-319-67244-1_21