Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED): DEFSPEED summary report

Ulla Ehrnsten, Wade Karlsen, Janne Pakarinen, Matias Ahonen, Pasi Kuivalainen, Mykola Ivanchenko, Tapio Saukkonen, Hannu Hänninen

    Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

    Abstract

    The DEFSPEED project (Influence of material, environment and strain rate on environmentally assisted cracking on austenitic nuclear materials) focussed on increasing the understanding of environmentally assisted cracking (EAC) and irradiation assisted stress corrosion cracking (IASCC) mechanisms in austenitic nuclear materials. Several sub-tasks were performed to achieve the set objectives during the four year project. The Super Slow Strain Rate Testing technique (SSSRT) was developed and employed for initiation studies on austenitic nuclear materials in LWR environments followed by in-depth investigations on deformation distribution. Austenitic nuclear materials show dynamic strain ageing behaviour, as described in a thesis work. The effect of environment on fracture toughness properties in nickel-based welds at slow strain rate in hydrogenated water was determined both for materials from dissimilar metal welds as well as on pure weld metal specimens. Irradiated austenitic stainless steels from plant internals were characterized using transmission electron microscopy (TEM) to increase the knowledge of radiation induced segregation and defect structures, which both play a role in IASCC. The latest international knowledge, applied for customer work, was brought to Finland by participating in international co-operation within the fields of EAC and IASCC. Education of new experts in the field of nuclear materials is an important objective for all SAFIR 2010 projects. In addition to participation of young experts in the project, a digital report archive was built, containing reports on nuclear materials written by VTT.
    Original languageEnglish
    Title of host publicationSAFIR2010: The Finnish Research Programme on Safety 2007-2010
    Subtitle of host publicationFinal Report
    PublisherVTT Technical Research Centre of Finland
    Chapter27
    Pages440-452
    ISBN (Electronic)978-951-38-7690-6
    ISBN (Print)978-951-38-7689-0
    Publication statusPublished - 2011
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Tiedotteita - Research Notes
    Number2571
    ISSN1235-0605

    Fingerprint

    stress corrosion cracking
    strain rate
    irradiation
    international cooperation
    Finland
    precipitation hardening
    theses
    austenitic stainless steels
    fracture strength
    metals
    education
    nickel
    transmission electron microscopy
    defects
    radiation
    water

    Cite this

    Ehrnsten, U., Karlsen, W., Pakarinen, J., Ahonen, M., Kuivalainen, P., Ivanchenko, M., ... Hänninen, H. (2011). Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED): DEFSPEED summary report. In SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report (pp. 440-452). VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2571
    Ehrnsten, Ulla ; Karlsen, Wade ; Pakarinen, Janne ; Ahonen, Matias ; Kuivalainen, Pasi ; Ivanchenko, Mykola ; Saukkonen, Tapio ; Hänninen, Hannu. / Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED) : DEFSPEED summary report. SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. VTT Technical Research Centre of Finland, 2011. pp. 440-452 (VTT Tiedotteita - Research Notes; No. 2571).
    @inbook{ced191beb744448da17b9b0511ad2f0d,
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    abstract = "The DEFSPEED project (Influence of material, environment and strain rate on environmentally assisted cracking on austenitic nuclear materials) focussed on increasing the understanding of environmentally assisted cracking (EAC) and irradiation assisted stress corrosion cracking (IASCC) mechanisms in austenitic nuclear materials. Several sub-tasks were performed to achieve the set objectives during the four year project. The Super Slow Strain Rate Testing technique (SSSRT) was developed and employed for initiation studies on austenitic nuclear materials in LWR environments followed by in-depth investigations on deformation distribution. Austenitic nuclear materials show dynamic strain ageing behaviour, as described in a thesis work. The effect of environment on fracture toughness properties in nickel-based welds at slow strain rate in hydrogenated water was determined both for materials from dissimilar metal welds as well as on pure weld metal specimens. Irradiated austenitic stainless steels from plant internals were characterized using transmission electron microscopy (TEM) to increase the knowledge of radiation induced segregation and defect structures, which both play a role in IASCC. The latest international knowledge, applied for customer work, was brought to Finland by participating in international co-operation within the fields of EAC and IASCC. Education of new experts in the field of nuclear materials is an important objective for all SAFIR 2010 projects. In addition to participation of young experts in the project, a digital report archive was built, containing reports on nuclear materials written by VTT.",
    author = "Ulla Ehrnsten and Wade Karlsen and Janne Pakarinen and Matias Ahonen and Pasi Kuivalainen and Mykola Ivanchenko and Tapio Saukkonen and Hannu H{\"a}nninen",
    year = "2011",
    language = "English",
    isbn = "978-951-38-7689-0",
    series = "VTT Tiedotteita - Research Notes",
    publisher = "VTT Technical Research Centre of Finland",
    number = "2571",
    pages = "440--452",
    booktitle = "SAFIR2010: The Finnish Research Programme on Safety 2007-2010",
    address = "Finland",

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    Ehrnsten, U, Karlsen, W, Pakarinen, J, Ahonen, M, Kuivalainen, P, Ivanchenko, M, Saukkonen, T & Hänninen, H 2011, Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED): DEFSPEED summary report. in SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. VTT Technical Research Centre of Finland, VTT Tiedotteita - Research Notes, no. 2571, pp. 440-452.

    Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED) : DEFSPEED summary report. / Ehrnsten, Ulla; Karlsen, Wade; Pakarinen, Janne; Ahonen, Matias; Kuivalainen, Pasi; Ivanchenko, Mykola; Saukkonen, Tapio; Hänninen, Hannu.

    SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. VTT Technical Research Centre of Finland, 2011. p. 440-452 (VTT Tiedotteita - Research Notes; No. 2571).

    Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

    TY - CHAP

    T1 - Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED)

    T2 - DEFSPEED summary report

    AU - Ehrnsten, Ulla

    AU - Karlsen, Wade

    AU - Pakarinen, Janne

    AU - Ahonen, Matias

    AU - Kuivalainen, Pasi

    AU - Ivanchenko, Mykola

    AU - Saukkonen, Tapio

    AU - Hänninen, Hannu

    PY - 2011

    Y1 - 2011

    N2 - The DEFSPEED project (Influence of material, environment and strain rate on environmentally assisted cracking on austenitic nuclear materials) focussed on increasing the understanding of environmentally assisted cracking (EAC) and irradiation assisted stress corrosion cracking (IASCC) mechanisms in austenitic nuclear materials. Several sub-tasks were performed to achieve the set objectives during the four year project. The Super Slow Strain Rate Testing technique (SSSRT) was developed and employed for initiation studies on austenitic nuclear materials in LWR environments followed by in-depth investigations on deformation distribution. Austenitic nuclear materials show dynamic strain ageing behaviour, as described in a thesis work. The effect of environment on fracture toughness properties in nickel-based welds at slow strain rate in hydrogenated water was determined both for materials from dissimilar metal welds as well as on pure weld metal specimens. Irradiated austenitic stainless steels from plant internals were characterized using transmission electron microscopy (TEM) to increase the knowledge of radiation induced segregation and defect structures, which both play a role in IASCC. The latest international knowledge, applied for customer work, was brought to Finland by participating in international co-operation within the fields of EAC and IASCC. Education of new experts in the field of nuclear materials is an important objective for all SAFIR 2010 projects. In addition to participation of young experts in the project, a digital report archive was built, containing reports on nuclear materials written by VTT.

    AB - The DEFSPEED project (Influence of material, environment and strain rate on environmentally assisted cracking on austenitic nuclear materials) focussed on increasing the understanding of environmentally assisted cracking (EAC) and irradiation assisted stress corrosion cracking (IASCC) mechanisms in austenitic nuclear materials. Several sub-tasks were performed to achieve the set objectives during the four year project. The Super Slow Strain Rate Testing technique (SSSRT) was developed and employed for initiation studies on austenitic nuclear materials in LWR environments followed by in-depth investigations on deformation distribution. Austenitic nuclear materials show dynamic strain ageing behaviour, as described in a thesis work. The effect of environment on fracture toughness properties in nickel-based welds at slow strain rate in hydrogenated water was determined both for materials from dissimilar metal welds as well as on pure weld metal specimens. Irradiated austenitic stainless steels from plant internals were characterized using transmission electron microscopy (TEM) to increase the knowledge of radiation induced segregation and defect structures, which both play a role in IASCC. The latest international knowledge, applied for customer work, was brought to Finland by participating in international co-operation within the fields of EAC and IASCC. Education of new experts in the field of nuclear materials is an important objective for all SAFIR 2010 projects. In addition to participation of young experts in the project, a digital report archive was built, containing reports on nuclear materials written by VTT.

    M3 - Chapter or book article

    SN - 978-951-38-7689-0

    T3 - VTT Tiedotteita - Research Notes

    SP - 440

    EP - 452

    BT - SAFIR2010: The Finnish Research Programme on Safety 2007-2010

    PB - VTT Technical Research Centre of Finland

    ER -

    Ehrnsten U, Karlsen W, Pakarinen J, Ahonen M, Kuivalainen P, Ivanchenko M et al. Influence of Material, Environment and Strain Rate on Environmentally Assisted Cracking of Austenitic Nuclear Materials (DEFSPEED): DEFSPEED summary report. In SAFIR2010: The Finnish Research Programme on Safety 2007-2010: Final Report. VTT Technical Research Centre of Finland. 2011. p. 440-452. (VTT Tiedotteita - Research Notes; No. 2571).