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

doi:10.1007/978-3-319-67244-1_21

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

^*Corresponding author for this work

Department of Energy and Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

2 Citations (Scopus)

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 language	English
Title of host publication	Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
Publisher	Springer
Pages	321-334
Number of pages	14
Volume	Part F9
ISBN (Print)	9783319672434
DOIs	https://doi.org/10.1007/978-3-319-67244-1_21
Publication status	Published - 2018
MoE publication type	A4 Conference publication
Event	International Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors - Portland, United States Duration: 13 Aug 2017 → 17 Aug 2017 Conference number: 18

Publication series

Name	Minerals, Metals and Materials Series
Volume	Part F9
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	International Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors
Country/Territory	United States
City	Portland
Period	13/08/2017 → 17/08/2017

Keywords

Alloy 690
Cold work
NiCr
Short-range ordering
Thermal ageing
Thermal treatment

Access to Document

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

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 Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (Vol. Part F9, pp. 321-334). (Minerals, Metals and Materials Series; Vol. Part F9). Springer. https://doi.org/10.1007/978-3-319-67244-1_21

Mouginot, Roman ; Sarikka, Teemu ; Heikkilä, Mikko et al. / 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. Vol. Part F9 Springer, 2018. pp. 321-334 (Minerals, Metals and Materials Series).

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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, Cold work, NiCr, Short-range ordering, Thermal ageing, Thermal treatment",

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",

year = "2018",

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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 Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. vol. Part F9, Minerals, Metals and Materials Series, vol. Part F9, Springer, pp. 321-334, International Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors, Portland, Oregon, United States, 13/08/2017. 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 et al.
Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Vol. Part F9 Springer, 2018. p. 321-334 (Minerals, Metals and Materials Series; Vol. Part F9).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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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 - Conference code: 18

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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 - Cold work

KW - NiCr

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KW - Thermal ageing

KW - Thermal treatment

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

PB - Springer

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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 Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Vol. Part F9. Springer. 2018. p. 321-334. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-319-67244-1_21

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

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