A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld

Sebastian Lindqvist (Corresponding Author), Matias Ahonen, Jari Lydman, Pentti Arffman, Hannu Hänninen

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

    Original languageEnglish
    Pages (from-to)320-334
    Number of pages15
    JournalEngineering Fracture Mechanics
    Volume214
    DOIs
    Publication statusPublished - 1 Jun 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Dissimilar metals
    Welds
    Cracks
    Fracture toughness
    Fusion reactions
    Brittle fracture
    Steel structures
    Metals

    Keywords

    • Brittle fracture
    • Brittle fracture initiation
    • Crack path
    • Dissimilar metal weld
    • Master Curve

    Cite this

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    abstract = "For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.",
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    A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld. / Lindqvist, Sebastian (Corresponding Author); Ahonen, Matias; Lydman, Jari; Arffman, Pentti; Hänninen, Hannu.

    In: Engineering Fracture Mechanics, Vol. 214, 01.06.2019, p. 320-334.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Lindqvist, Sebastian

    AU - Ahonen, Matias

    AU - Lydman, Jari

    AU - Arffman, Pentti

    AU - Hänninen, Hannu

    PY - 2019/6/1

    Y1 - 2019/6/1

    N2 - For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

    AB - For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

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    KW - Brittle fracture initiation

    KW - Crack path

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