@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 Funding Information: Samples were aged and provided by the Korea Atomic Energy Research Institute (KAERI). The authors wish to thank Prof. Young Suk Kim and Sung Soo Kim from KAERI for initiating the study and providing the Alloy 690 materials. The study was carried out at Aalto University and VTT within the “Thermal ageing and EAC research for plant life manage-ment” (THELMA) project of the Finnish Research Programme on Nuclear Power Plant Safety 2015–2018 (SAFIR 2018). XRD measurements were performed at the Helsinki University, Laboratory of Inorganic Chemistry. Publisher Copyright: {\textcopyright} The Minerals, Metals & Materials Society 2018. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.; 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, EDM 2017 ; Conference date: 13-08-2017 Through 17-08-2017",
year = "2018",
month = jan,
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",
}