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Irreversible Carbon Diffusion in Growth of Cast Iron

Published online by Cambridge University Press:  21 February 2011

K. Nagaoka  and
M. Souma
K. Nagaoka
Affiliation:
Faculty of Eng., Hokkaido University, Kita 13 Nishi 8, Kitaku, Sapporo, 060, Japan
M. Souma
Affiliation:
Faculty of Eng., Hokkaido University, Kita 13 Nishi 8, Kitaku, Sapporo, 060, Japan
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Abstract

In gray cast iron carbon diffuses irreversibly and the result is a growth remaining castoff voids and graphite redistribution. The origin of primary growth is in the mechanism of carbon diffusion which is controlled by a ratchet at graphite where carbon is carried by vacancy flow. Growth of flake cast iron in oxygen reduced air at low oxygen content is accounted for by self carburizing due to a reaction of penetrated oxygen and graphite flakes. For the irreversible carbon migration by gaseous carrier another ratchet is suggested. Cracking theory for primary growth is replaced by castoff void theory, and oxidation theory is modified.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 355
Copyright
Copyright © Materials Research Society 1985

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