Effect of Pearlite Structure on Lattice Strain in Ferrite Estimated by the Williamson-Hall Method

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  • Tanaka Yuki
    Department of Materials Science and Engineering, Kyushu University
  • Akama Daichi
    Department of Materials Science and Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research(WPI-I2CNER), Kyushu University
  • Nakada Nobuo
    Department of Materials Science and Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research(WPI-I2CNER), Kyushu University
  • Tsuchiyama Toshihiro
    Department of Materials Science and Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research(WPI-I2CNER), Kyushu University
  • Takaki Setsuo
    Department of Materials Science and Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research(WPI-I2CNER), Kyushu University

Bibliographic Information

Other Title
  • Williamson-Hall法で求めたフェライトの格子ひずみに及ぼすパーライト組織の影響
  • Williamson-Hallホウ デ モトメタ フェライト ノ コウシヒズミ ニ オヨボス パーライト ソシキ ノ エイキョウ

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Description

The effect of pearlite on the X-ray diffraction peak reflected from ferrite phase in ferrite-pearlite steel was investigated using normalized carbon steels with different volume fraction of pearlite and a hypereutectoid steel with various pearlite lamellar spacing. The lattice strain in ferrite phase, which causes the broadening of X-ray diffraction peak, was increased in proportion to both of the volume fraction of pearlite and the inverse of pearlite lamellar spacing. As a result, the lattice strain in ferrite-pearlite steel can be simply formulated as functions of them. On the other hand, TEM observation reveals that pearlite has low-density dislocation in ferrite phase. This result suggests that the misfit between ferrite and cementite in pearlite generates the significant amount of elastic strain, which leads to the increasing in lattice strain. Therefore, the dislocation density must be overestimated in carbon steels with pearlite, if it is estimated from the experimental lattice strain directly.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 100 (10), 1229-1231, 2014

    The Iron and Steel Institute of Japan

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