Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite

Toshihiko Teshima, Makoto Kosaka, Kohsaku Ushioda, Norimitsu Koga, Nobuo Nakada

    Abstract

    To fully understand the fracture mechanism of pearlitic steel, the effects of lamellar alignment on both cementite cracking and plastic deformation behavior were investigated in two pearlitic materials with lamellar and spheroidized cementite phases. Digital image correlation revealed that local strain develops heterogeneously in the lamellar pearlite structure, but homogeneously in the spheroidized structure. The heterogeneous local strain distribution tends to coincide better with a pearlite colony than with a pearlite block. This finding suggests that the plastic deformation behavior of pearlite is strongly affected by the alignment of the ferrite/cementite lamellae. A detailed crystallography-based analysis revealed that the ferrite matrix was significantly plastically deformed in colonies in which the lamellae were aligned at approximately 45° relative to the direction of applied tension, regardless of the limited deformation of the cementite phase; this caused high degrees of strain in such colonies. In contrast, plastic deformation of the ferrite matrix was restricted by the lamellar cementite in colonies in which the lamellae were aligned parallel to the tensile direction. As a result, the lamellar cementite experienced plastic deformation simultaneously with the ferrite matrix as the applied strain was increased. This simultaneous plastic deformation caused shear deformation in lamellar structures on identical slip systems, by which the ductile fracture associated with cementite cracking occurred.

    Original languageEnglish
    Pages (from-to)223-229
    Number of pages7
    JournalMaterials Science and Engineering A
    Volume679
    DOIs
    StatePublished - 2017 Jan 2

    Fingerprint

    Plastic deformation
    Pearlite
    Ferrite
    Lamellar structures
    Crystallography
    Ductile fracture
    Shear deformation
    Steel

    Keywords

    • Cementite cracking
    • Colony
    • Lamellar alignment
    • Local strain distribution
    • Pearlite

    ASJC Scopus subject areas

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

    Cite this

    Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite. / Teshima, Toshihiko; Kosaka, Makoto; Ushioda, Kohsaku; Koga, Norimitsu; Nakada, Nobuo.

    In: Materials Science and Engineering A, Vol. 679, 02.01.2017, p. 223-229.

    Research output: Contribution to journalArticle

    Teshima, Toshihiko; Kosaka, Makoto; Ushioda, Kohsaku; Koga, Norimitsu; Nakada, Nobuo / Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite.

    In: Materials Science and Engineering A, Vol. 679, 02.01.2017, p. 223-229.

    Research output: Contribution to journalArticle

    @article{4e3fa64dac054952b134c0109402dde0,
    title = "Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite",
    keywords = "Cementite cracking, Colony, Lamellar alignment, Local strain distribution, Pearlite",
    author = "Toshihiko Teshima and Makoto Kosaka and Kohsaku Ushioda and Norimitsu Koga and Nobuo Nakada",
    year = "2017",
    month = "1",
    doi = "10.1016/j.msea.2016.10.018",
    volume = "679",
    pages = "223--229",
    journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
    issn = "0921-5093",
    publisher = "Elsevier BV",

    }

    TY - JOUR

    T1 - Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite

    AU - Teshima,Toshihiko

    AU - Kosaka,Makoto

    AU - Ushioda,Kohsaku

    AU - Koga,Norimitsu

    AU - Nakada,Nobuo

    PY - 2017/1/2

    Y1 - 2017/1/2

    N2 - To fully understand the fracture mechanism of pearlitic steel, the effects of lamellar alignment on both cementite cracking and plastic deformation behavior were investigated in two pearlitic materials with lamellar and spheroidized cementite phases. Digital image correlation revealed that local strain develops heterogeneously in the lamellar pearlite structure, but homogeneously in the spheroidized structure. The heterogeneous local strain distribution tends to coincide better with a pearlite colony than with a pearlite block. This finding suggests that the plastic deformation behavior of pearlite is strongly affected by the alignment of the ferrite/cementite lamellae. A detailed crystallography-based analysis revealed that the ferrite matrix was significantly plastically deformed in colonies in which the lamellae were aligned at approximately 45° relative to the direction of applied tension, regardless of the limited deformation of the cementite phase; this caused high degrees of strain in such colonies. In contrast, plastic deformation of the ferrite matrix was restricted by the lamellar cementite in colonies in which the lamellae were aligned parallel to the tensile direction. As a result, the lamellar cementite experienced plastic deformation simultaneously with the ferrite matrix as the applied strain was increased. This simultaneous plastic deformation caused shear deformation in lamellar structures on identical slip systems, by which the ductile fracture associated with cementite cracking occurred.

    AB - To fully understand the fracture mechanism of pearlitic steel, the effects of lamellar alignment on both cementite cracking and plastic deformation behavior were investigated in two pearlitic materials with lamellar and spheroidized cementite phases. Digital image correlation revealed that local strain develops heterogeneously in the lamellar pearlite structure, but homogeneously in the spheroidized structure. The heterogeneous local strain distribution tends to coincide better with a pearlite colony than with a pearlite block. This finding suggests that the plastic deformation behavior of pearlite is strongly affected by the alignment of the ferrite/cementite lamellae. A detailed crystallography-based analysis revealed that the ferrite matrix was significantly plastically deformed in colonies in which the lamellae were aligned at approximately 45° relative to the direction of applied tension, regardless of the limited deformation of the cementite phase; this caused high degrees of strain in such colonies. In contrast, plastic deformation of the ferrite matrix was restricted by the lamellar cementite in colonies in which the lamellae were aligned parallel to the tensile direction. As a result, the lamellar cementite experienced plastic deformation simultaneously with the ferrite matrix as the applied strain was increased. This simultaneous plastic deformation caused shear deformation in lamellar structures on identical slip systems, by which the ductile fracture associated with cementite cracking occurred.

    KW - Cementite cracking

    KW - Colony

    KW - Lamellar alignment

    KW - Local strain distribution

    KW - Pearlite

    UR - http://www.scopus.com/inward/record.url?scp=84992411690&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84992411690&partnerID=8YFLogxK

    U2 - 10.1016/j.msea.2016.10.018

    DO - 10.1016/j.msea.2016.10.018

    M3 - Article

    VL - 679

    SP - 223

    EP - 229

    JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

    T2 - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

    JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

    SN - 0921-5093

    ER -