球状化組織の炭素鋼の強度と延性について

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So far, it has been said that the ductility of metal containing hard particles depends only on the volume fraction of particles, f, and the ductility decreases with the increase of f. On the other hand, according to engineering experiences, it is well known about, at least, spheroidal carbon steels, that the larger cementite size, the better cold formability of it. Therefore, the purpose of this work is to investigate the influence of not only the amount of spheroidal cementite particles, but also, especially, the cementite particle size on the strength and ductility of spheroidized carbon steels. And the relationships between structural factors and work hardening charcteristics, rupture strength, rupture surface appearances and so on were studied, and the following results were obtained;(1) Work hardening characteristics coincides, on the whole, with the theory presented already, but power number of f/(1-f)d is about 0.20.(2) The amounts of strain before rupture, including almost from 10% of rupture strain corresponding to strain at the onset of local necking to 80% of rupture strain, have relation to work hardening rate, that is, the more work hardening rate, the less strain before rupture.(3) The contribution of spheroidal carbide size to rupture ductility is found to be little but distinct, and the bigger carbide size, the more rupture ductility.(4) Mean diameter of dimples of ruptured surface is about 1.5 or 2 times ‘true’ mean free ferrite path in the range of experiment.(5) The tensile fracture stress at the longitudinal axis of specimen increase with the decrease of d and f. Furthermore, the results (1), (3), (5), mentioned above, were expressed as experimental equations.

球状化組織の炭素鋼の強度と延性について

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