Machinability of Hypo-Eutectoid Graphitic Steels

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  • Sueyoshi Hidekazu
    Department of Mechanical Engineering, Faculty of Engineering, Kagoshima University
  • Ohshige Toshinori
    Graduate Student, Kagoshima University
  • Suenaga Katsuro
    Department of Mechanical Engineering, Faculty of Engineering, Kagoshima University
  • Tanaka Ryohei
    Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University

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  • 亜共析黒鉛鋼の被削性
  • アキョウセキ コクエン コウ ノ ヒサクセイ

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Abstract

In order to develop a new type of free cutting steel, machinability tests have been carried out for a series of hypo-eutectoid graphitic steels composed of ferrite matrices and graphite nodules.<BR>In the presence of the graphite nodules the frictional coefficient between tool and chip decreased and the shear angle of chip increased. Therefore, the cutting forces decreased with increasing volume fraction of graphite. The lubrication effect of the graphite nodules became remarkable as the mean diameter of the graphite nodule increased and the mean ferrite path between graphite nodules decreased.<BR>The hypo-eutectoid graphitic steels exhibited an excellent chip-disposability because the curvature of chip is small and the graphite nodules promotes the crack propagation in chip.<BR>The influence of graphite nodules on the surface roughness was found to be disregarded from a practical point of view.<BR>It was concluded that the hypo-eutectoid graphitic steel having an appropriate structure of matrices and graphite nodules can be good free cutting structural steel.

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