Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
Machinability of Hypo-Eutectoid Graphitic Steels
Hidekazu SueyoshiToshinori OhshigeKatsuro SuenagaRyohei Tanaka
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1988 Volume 52 Issue 12 Pages 1285-1292

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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.
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.
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.
The influence of graphite nodules on the surface roughness was found to be disregarded from a practical point of view.
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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