Fracture toughness enhanced by severe plastic deformation in low carbon steel

Masaki Tanaka, Naoki Fujimoto, Tatsuo Yokote, Kenji Higashida

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

    1 Citation (Scopus)

    Abstract

    The enhancement of toughness at low temperatures in fine-grained low carbon steel was studied, basing on the theory of crack-tip shielding due to dislocations. Low carbon steel was subjected to an accumulative roll bonding (ARB) process for grain refining. The grain size perpendicular to the normal direction was decreased to approximately 200nm after the ARB process. The fracture toughness of low carbon steel with the ARB process was measured at 77K by four-point bending, comparing with the fracture toughness of those without the ARB. It was found that the value of fracture toughness at 77K was increased by grain refining due to the ARB process, indicating that the ARB process enhances toughness at low temperatures and that the brittle-to-ductile transition (BDT) temperature shifted to a lower temperature. Quasi-two-dimensional simulations of dislocation dynamics, taking into account crack tip shielding due to dislocations, were performed to investigate the effect of a dislocation source spacing along a crack front on the BDT. The simulation indicates that the BDT temperature is decreased by decreasing the dislocation source spacing.

    Original languageEnglish
    Title of host publicationMaterials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation
    PublisherTrans Tech Publications Ltd
    Pages637-642
    Number of pages6
    ISBN (Electronic)978-0-87849-360-9
    DOIs
    Publication statusPublished - 2008
    Event4th International Conference on Nanomaterials by Severe Plastic Deformation - Goslar, Germany
    Duration: Aug 18 2008Aug 22 2008

    Publication series

    NameMaterials Science Forum
    Volume584-586 PART 2
    ISSN (Print)0255-5476
    ISSN (Electronic)1662-9752

    Other

    Other4th International Conference on Nanomaterials by Severe Plastic Deformation
    Country/TerritoryGermany
    CityGoslar
    Period8/18/088/22/08

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Fingerprint

    Dive into the research topics of 'Fracture toughness enhanced by severe plastic deformation in low carbon steel'. Together they form a unique fingerprint.

    Cite this