Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract)

Pekka Nevasmaa, Petra Holmström, Päivi Karjalainen-Roikonen, Teemu Sarikka, Matias Ahonen, Roman Mouginot, Ulla Ehrnsten, Anssi Brederholm, Pertti Aaltonen, Hannu Hänninen

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    Abstract

    A characteristic feature of dissimilar metal weld (DMW) is the metallurgical and material property mis-match resulting from a steep gradient of microstructures with significantly different strength and toughness properties. This mis-match inevitably affects the entire failure behaviour of DMWs under external operational loads, not only from crack initiation standpoint, but especially regarding the development of crack driving force accentuating crack path deviation and subsequent crack growth. The determination of relevant fracture toughness properties for all the different microstructural regions of the DMW is of utmost importance for successful structural integrity and lifetime analyses. This paper deals with experimental material characterisation of two configurations of ferrite (SA508)-austenite (Type 304/316) DMWs made using (i) a beveled V-groove and Alloy 82/182 filler metal with a buttering layer and (ii) a narrow-gap weld and Alloy 52 filler metal without any buttering. Results of hardness surveys and fracture mechanical (J-R curve) tests are presented and analysed. The role of mis-match (i.e. metallurgical constraint) in e.g. promoting sudden crack path deviations is discussed in the light of detailed post-test sectioning metallography and specimen fractography identifying the actual crack initiation and propagation path.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages106-106
    ISBN (Electronic)978-951-38-8030-9
    ISBN (Print)978-951-38-8029-3
    Publication statusPublished - 2013

    Fingerprint

    Dissimilar metals
    Austenite
    Ferrite
    Welds
    Filler metals
    Cracks
    Crack initiation
    Crack propagation
    Temperature
    Fractography
    Metallography
    Structural integrity
    Toughness
    Fracture toughness
    Materials properties
    Hardness
    Microstructure

    Cite this

    Nevasmaa, P., Holmström, P., Karjalainen-Roikonen, P., Sarikka, T., Ahonen, M., Mouginot, R., ... Hänninen, H. (2013). Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract). In Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts (pp. 106-106). Espoo: VTT Technical Research Centre of Finland.
    Nevasmaa, Pekka ; Holmström, Petra ; Karjalainen-Roikonen, Päivi ; Sarikka, Teemu ; Ahonen, Matias ; Mouginot, Roman ; Ehrnsten, Ulla ; Brederholm, Anssi ; Aaltonen, Pertti ; Hänninen, Hannu. / Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract). Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 106-106
    @inbook{3db4f07a483d427d91d6d24a58d2e80a,
    title = "Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract)",
    abstract = "A characteristic feature of dissimilar metal weld (DMW) is the metallurgical and material property mis-match resulting from a steep gradient of microstructures with significantly different strength and toughness properties. This mis-match inevitably affects the entire failure behaviour of DMWs under external operational loads, not only from crack initiation standpoint, but especially regarding the development of crack driving force accentuating crack path deviation and subsequent crack growth. The determination of relevant fracture toughness properties for all the different microstructural regions of the DMW is of utmost importance for successful structural integrity and lifetime analyses. This paper deals with experimental material characterisation of two configurations of ferrite (SA508)-austenite (Type 304/316) DMWs made using (i) a beveled V-groove and Alloy 82/182 filler metal with a buttering layer and (ii) a narrow-gap weld and Alloy 52 filler metal without any buttering. Results of hardness surveys and fracture mechanical (J-R curve) tests are presented and analysed. The role of mis-match (i.e. metallurgical constraint) in e.g. promoting sudden crack path deviations is discussed in the light of detailed post-test sectioning metallography and specimen fractography identifying the actual crack initiation and propagation path.",
    author = "Pekka Nevasmaa and Petra Holmstr{\"o}m and P{\"a}ivi Karjalainen-Roikonen and Teemu Sarikka and Matias Ahonen and Roman Mouginot and Ulla Ehrnsten and Anssi Brederholm and Pertti Aaltonen and Hannu H{\"a}nninen",
    note = "Project code: 71232",
    year = "2013",
    language = "English",
    isbn = "978-951-38-8029-3",
    pages = "106--106",
    booktitle = "Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts",
    publisher = "VTT Technical Research Centre of Finland",
    address = "Finland",

    }

    Nevasmaa, P, Holmström, P, Karjalainen-Roikonen, P, Sarikka, T, Ahonen, M, Mouginot, R, Ehrnsten, U, Brederholm, A, Aaltonen, P & Hänninen, H 2013, Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract). in Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. VTT Technical Research Centre of Finland, Espoo, pp. 106-106.

    Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract). / Nevasmaa, Pekka; Holmström, Petra; Karjalainen-Roikonen, Päivi; Sarikka, Teemu; Ahonen, Matias; Mouginot, Roman; Ehrnsten, Ulla; Brederholm, Anssi; Aaltonen, Pertti; Hänninen, Hannu.

    Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. Espoo : VTT Technical Research Centre of Finland, 2013. p. 106-106.

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    TY - CHAP

    T1 - Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract)

    AU - Nevasmaa, Pekka

    AU - Holmström, Petra

    AU - Karjalainen-Roikonen, Päivi

    AU - Sarikka, Teemu

    AU - Ahonen, Matias

    AU - Mouginot, Roman

    AU - Ehrnsten, Ulla

    AU - Brederholm, Anssi

    AU - Aaltonen, Pertti

    AU - Hänninen, Hannu

    N1 - Project code: 71232

    PY - 2013

    Y1 - 2013

    N2 - A characteristic feature of dissimilar metal weld (DMW) is the metallurgical and material property mis-match resulting from a steep gradient of microstructures with significantly different strength and toughness properties. This mis-match inevitably affects the entire failure behaviour of DMWs under external operational loads, not only from crack initiation standpoint, but especially regarding the development of crack driving force accentuating crack path deviation and subsequent crack growth. The determination of relevant fracture toughness properties for all the different microstructural regions of the DMW is of utmost importance for successful structural integrity and lifetime analyses. This paper deals with experimental material characterisation of two configurations of ferrite (SA508)-austenite (Type 304/316) DMWs made using (i) a beveled V-groove and Alloy 82/182 filler metal with a buttering layer and (ii) a narrow-gap weld and Alloy 52 filler metal without any buttering. Results of hardness surveys and fracture mechanical (J-R curve) tests are presented and analysed. The role of mis-match (i.e. metallurgical constraint) in e.g. promoting sudden crack path deviations is discussed in the light of detailed post-test sectioning metallography and specimen fractography identifying the actual crack initiation and propagation path.

    AB - A characteristic feature of dissimilar metal weld (DMW) is the metallurgical and material property mis-match resulting from a steep gradient of microstructures with significantly different strength and toughness properties. This mis-match inevitably affects the entire failure behaviour of DMWs under external operational loads, not only from crack initiation standpoint, but especially regarding the development of crack driving force accentuating crack path deviation and subsequent crack growth. The determination of relevant fracture toughness properties for all the different microstructural regions of the DMW is of utmost importance for successful structural integrity and lifetime analyses. This paper deals with experimental material characterisation of two configurations of ferrite (SA508)-austenite (Type 304/316) DMWs made using (i) a beveled V-groove and Alloy 82/182 filler metal with a buttering layer and (ii) a narrow-gap weld and Alloy 52 filler metal without any buttering. Results of hardness surveys and fracture mechanical (J-R curve) tests are presented and analysed. The role of mis-match (i.e. metallurgical constraint) in e.g. promoting sudden crack path deviations is discussed in the light of detailed post-test sectioning metallography and specimen fractography identifying the actual crack initiation and propagation path.

    M3 - Conference abstract in proceedings

    SN - 978-951-38-8029-3

    SP - 106

    EP - 106

    BT - Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Nevasmaa P, Holmström P, Karjalainen-Roikonen P, Sarikka T, Ahonen M, Mouginot R et al. Fracture mechanical characterisation of ferrite-austenite dissimilar metal welds (DMWs) for elevated temperature service in view of metallurgical mis-match (Only the abstract). In Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. Espoo: VTT Technical Research Centre of Finland. 2013. p. 106-106