Relation between Young’s Modulus and Elastic Stiffness in Ferritic Steels

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  • Takaki Setsuo
    Research Center for Steel, Kyushu University
  • Masumura Takuro
    Department of Materials Science and Engineering, Kyushu University
  • Tsuchiyama Toshihiro
    Research Center for Steel, Kyushu University Department of Materials Science and Engineering, Kyushu University

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  • フェライト鋼におけるヤング率と弾性スティフネスの関係
  • フェライトコウ ニ オケル ヤングリツ ト ダンセイ スティフネス ノ カンケイ

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<p>In pure iron, the Young’s modulus ratio E100/Ehkl in single crystal is expressed as follows as a function of the orientation parameter Γ: E100/Ehkl=1–1.6063Γ. Under the condition that this relationship stands up on commercial ferritic and martensitic steels with various chemical composition and Poisson’s ratio is also identical at 0.291, the elastic stiffness cij was calculated as follows in connection with Young’s modulus Ep of poly crystal ferritic steels: c11=1.0970Ep, c12=0.6477Ep, c44=0.5424Ep. As a result, the elastic stiffness ratio c12/c44 and the anisotropy parameter Ai (=2c44/(c11–c12)) are given at 1.194 and 2.414 independent on the value of Ep, respectively. The contrast factor Ch00 and the parameter q, that are required for the dislocation analysis by the modified Williamson-Hall method, are represented as follows as a function of the screw component S in dislocation: Ch00=0.263+0.044×S and q=1.382+1.27×S.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 106 (11), 867-870, 2020

    The Iron and Steel Institute of Japan

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