Abstract
The dissolved oxygen in molten cast iron is gradually and continuously increased by melting with some slags, and applying this treatment, the changes of micro-structure and other properties of cast iron is examined.The results are summerized as follows:(1) Covering the melt by slags of various compositions, the decaruburization curve of Fe-C alloy was analysed and consequently the behaviour of slags was clarified.(2) At commercial cast iron, oxygen supplied from slag reacts only with Si and did not react with Mn, C. Si decreases with the basicity of slag and treating time at the melting temperature of 1350°.(3) If oxygen gradually increases in cast iron having flake graphite structure, the microstructure changes as follows: flake gr. str.→rose gr. str.→eut gr. str.→inverse chilled str.→white cast iron structure (ledeburite).
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