Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite

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

    抄録

    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.

    本文言語英語
    ページ(範囲)223-229
    ページ数7
    ジャーナルMaterials Science and Engineering A
    679
    DOI
    ジャーナル掲載日出版済み - 2017 1 2

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

    Keywords

      ASJC Scopus subject areas

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

      これを引用

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

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

      研究成果: ジャーナルへの寄稿記事

      Teshima T, Kosaka M, Ushioda K, Koga N, Nakada N. Local cementite cracking induced by heterogeneous plastic deformation in lamellar pearlite. Materials Science and Engineering A. 2017 1 2;679:223-229. 利用可能場所, DOI: 10.1016/j.msea.2016.10.018

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

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

      研究成果: ジャーナルへの寄稿記事

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      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",
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      AU - Teshima,Toshihiko

      AU - Kosaka,Makoto

      AU - Ushioda,Kohsaku

      AU - Koga,Norimitsu

      AU - Nakada,Nobuo

      PY - 2017/1/2

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      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.

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      KW - Lamellar alignment

      KW - Local strain distribution

      KW - Pearlite

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