Effect of microstructure on formation of ductile fracture surface in steel plate

Tomoaki Fukahori, Shinichi Suzuki, Naoya Yamada, Masatoshi Aramaki, Osamu Furukimi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    In recent years, high strength steel plates for building and pipelines have been required to improve ductile fracture properties, assuming ground deformation in earthquake-prone region. The ductile fracture is performed by the result from coalescence of micro-voids followed by the nucleation and growth[1]. Fractured surface morphology reflects the void coalescence process, so it is important to consider the relationship between the fracture surface morphology and the micro-voids formation beneath the fractured surface to consider the ductile fracture properties. The voids nucleate sites are mainly particles such as inclusions or precipitates, and grain boundries. These voids grow and coalesce according to three modes. The first mode is directly coalescence of voids followed by growth[2]. The second one is the coalescence of voids caused by shear deformation followed by internal necking between voids[3]. The third one is the coalescence of voids caused by micro-voids nucleation in shear band between two larger voids[4]. It is expected that these modes influence local elongation property which is one of the indices for ductile fracture property through the formation of fractured surface. In this study, local deformation energy which is measured by load-displacement curve in tensile test is examined by focusing the voids nucleation, growth and coalescence, for high tensile strength plates of TS480-830MPa which is controlled by the microstructure through the cooling rate of heat treatment. The deformation energy is useful to consider the ductile fracture property of steel plates which have a different tensile strength.

    Original languageEnglish
    Title of host publicationTHERMEC 2011 Supplement
    Pages678-683
    Number of pages6
    DOIs
    Publication statusPublished - 2012
    Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
    Duration: Aug 1 2011Aug 5 2011

    Publication series

    NameAdvanced Materials Research
    Volume409
    ISSN (Print)1022-6680

    Other

    Other7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
    Country/TerritoryCanada
    CityQuebec City, QC
    Period8/1/118/5/11

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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