EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam

Aki Toivonen, Hannu Hänninen

    Research output: Contribution to conferenceConference AbstractScientific

    Abstract

    EAC susceptibilities of Alloy 600 and 690 and their weld metals with and without weld defects such as hot cracks were studied in pure and doped hydrogenated steam at 400oC on four-point bend (0.35- 1.1% strain) and U-bend specimens (5% strain). Contrary to the expectations, no EAC initiation from existing weld defects was observed. As expected, Alloy 600 and its weld metals Alloys 82 and 182 were much more prone to EAC initiation than Alloy 690 and its weld metals Alloys 52 and 152. Oxide structures remain the same in doped and pure steam, although the doped environment has an impact on the EAC initiation time and oxidation rate. Because of the similar oxide structures, the EAC mechanism is assumed to be the same in the studied environments. The application of doped steam testing as accelerating testing method for environmentally assisted cracking of nickel-based alloys is discussed.
    Original languageEnglish
    Publication statusPublished - 2017
    MoE publication typeNot Eligible
    Event20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017 - Prague, Czech Republic
    Duration: 3 Sep 20177 Sep 2017
    http://www.prague-corrosion-2017.com/

    Conference

    Conference20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017
    Abbreviated titleEurocorr 2017
    CountryCzech Republic
    CityPrague
    Period3/09/177/09/17
    Internet address

    Fingerprint

    Dissimilar metals
    Crack initiation
    Welds
    Steam
    Metals
    Defects
    Oxides
    Testing
    Nickel
    Cracks
    Oxidation

    Keywords

    • environmentally assisted cracking
    • nickel-based alloy
    • stress corrosion cracking
    • steam
    • dissimilar metal weld

    Cite this

    Toivonen, A., & Hänninen, H. (2017). EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam. Abstract from 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Prague, Czech Republic.
    Toivonen, Aki ; Hänninen, Hannu. / EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam. Abstract from 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Prague, Czech Republic.
    @conference{750a66f8eba74d17986e9d682d37eb1f,
    title = "EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam",
    abstract = "EAC susceptibilities of Alloy 600 and 690 and their weld metals with and without weld defects such as hot cracks were studied in pure and doped hydrogenated steam at 400oC on four-point bend (0.35- 1.1{\%} strain) and U-bend specimens (5{\%} strain). Contrary to the expectations, no EAC initiation from existing weld defects was observed. As expected, Alloy 600 and its weld metals Alloys 82 and 182 were much more prone to EAC initiation than Alloy 690 and its weld metals Alloys 52 and 152. Oxide structures remain the same in doped and pure steam, although the doped environment has an impact on the EAC initiation time and oxidation rate. Because of the similar oxide structures, the EAC mechanism is assumed to be the same in the studied environments. The application of doped steam testing as accelerating testing method for environmentally assisted cracking of nickel-based alloys is discussed.",
    keywords = "environmentally assisted cracking, nickel-based alloy, stress corrosion cracking, steam, dissimilar metal weld",
    author = "Aki Toivonen and Hannu H{\"a}nninen",
    note = "Absract reviwed SDA: SHP: SASUNE Nuclear ; 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Eurocorr 2017 ; Conference date: 03-09-2017 Through 07-09-2017",
    year = "2017",
    language = "English",
    url = "http://www.prague-corrosion-2017.com/",

    }

    Toivonen, A & Hänninen, H 2017, 'EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam' 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Prague, Czech Republic, 3/09/17 - 7/09/17, .

    EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam. / Toivonen, Aki; Hänninen, Hannu.

    2017. Abstract from 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Prague, Czech Republic.

    Research output: Contribution to conferenceConference AbstractScientific

    TY - CONF

    T1 - EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam

    AU - Toivonen, Aki

    AU - Hänninen, Hannu

    N1 - Absract reviwed SDA: SHP: SASUNE Nuclear

    PY - 2017

    Y1 - 2017

    N2 - EAC susceptibilities of Alloy 600 and 690 and their weld metals with and without weld defects such as hot cracks were studied in pure and doped hydrogenated steam at 400oC on four-point bend (0.35- 1.1% strain) and U-bend specimens (5% strain). Contrary to the expectations, no EAC initiation from existing weld defects was observed. As expected, Alloy 600 and its weld metals Alloys 82 and 182 were much more prone to EAC initiation than Alloy 690 and its weld metals Alloys 52 and 152. Oxide structures remain the same in doped and pure steam, although the doped environment has an impact on the EAC initiation time and oxidation rate. Because of the similar oxide structures, the EAC mechanism is assumed to be the same in the studied environments. The application of doped steam testing as accelerating testing method for environmentally assisted cracking of nickel-based alloys is discussed.

    AB - EAC susceptibilities of Alloy 600 and 690 and their weld metals with and without weld defects such as hot cracks were studied in pure and doped hydrogenated steam at 400oC on four-point bend (0.35- 1.1% strain) and U-bend specimens (5% strain). Contrary to the expectations, no EAC initiation from existing weld defects was observed. As expected, Alloy 600 and its weld metals Alloys 82 and 182 were much more prone to EAC initiation than Alloy 690 and its weld metals Alloys 52 and 152. Oxide structures remain the same in doped and pure steam, although the doped environment has an impact on the EAC initiation time and oxidation rate. Because of the similar oxide structures, the EAC mechanism is assumed to be the same in the studied environments. The application of doped steam testing as accelerating testing method for environmentally assisted cracking of nickel-based alloys is discussed.

    KW - environmentally assisted cracking

    KW - nickel-based alloy

    KW - stress corrosion cracking

    KW - steam

    KW - dissimilar metal weld

    UR - http://www.scopus.com/inward/record.url?scp=85052285057&partnerID=8YFLogxK

    M3 - Conference Abstract

    ER -

    Toivonen A, Hänninen H. EAC Crack Initiation in Ni-Based Alloy Dissimilar Metal Welds in Doped Steam. 2017. Abstract from 20th International Corrosion Congress & Process Safety Congress 2017, Eurocorr 2017, Prague, Czech Republic.