Effects of Microstructural Factors on the Tensile Properties of Hypo-Eutectoid Graphitic Steels

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  • Sueyoshi Hidekazu
    Department of Mechanical Engineering, Faculty of Engineering, Kagoshima University
  • Suenaga Katsuro
    Department of Mechanical Engineering, Faculty of Engineering, Kagoshima University
  • Tanaka Ryohei
    Department of Materials Science and Engineering, Tokyo Institute of Technology

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  • 亜共析黒鉛鋼の引張特性におよぼす組織学的因子の影響
  • アキョウセキ コクエン コウ ノ ヒッパリ トクセイ ニ オヨボス ソシキガク

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Abstract

Yield stress, tensile strength and ductility of hypo-eutectoid graphitic steels were studied in connection with microstructural factors such as ferritic grain size dF, volume fraction of graphite f, mean graphite nodule diameter dG, and mean ferrite path between graphite nodules λ.<BR>The graphitic steel containing graphite nodules in ferrite grain boundaries exhibited a yield point clearly, and the yield stress was found to depend on both factors dF−1⁄2 and λ−0.223, while the steel containing a number of graphite nodules in ferrite grains showed no yield point, and the 0.2% proof stress was nearly constant regardless of f, dF, dG or λ.<BR>The tensile strength of the graphitic steel increased proportionally to dF−1⁄2, but decreased slightly with increasing dG.<BR>Ductile fracture strain was given as a function of lndG and lnλ, or ln[(1−f)⁄f] by using a multiple regression analysis. Thus it was concluded that the ductility of the graphitic steel depends strongly on dG and λ as well as on the volume fraction of graphite.

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