Abstract
The influence of carbon and silicon on the spherulitic graphite iron, treated with 0.5%Mg in the form of Mg-Ni-Si-Fe-Cu-Al alloy containing 10.87%Mg,was investigated,using specimens cast in dry sand mould of dia. 14 mm. The following results were obtained:
(1) The matrix became pearlite plus ferrite when the total of carbon and silicon exceeded about 7% and manganese content was about 0.5%.
(2) The more the content of carbon in the iron increased,the larger the size of the spherulitic graphite in the iron became and the more its number increased.
(3) The more the content of silicon in the iron increased, the smaller the size of the spherulitic graphite in the iron became and the more its number increased.
(4) The more the content of carbon in the iron increased, the lighter the colouring of magnesium print became, the print being obtained in the same way as in sulphur print.
(5) The more the content of silicon in the iron increased, the heavier the colouring of the print became.
(6) Both desulphurization and decarburization of molten iron due to the addition of magnesium were promoted by increase of carbon or silicon in the melt, although the alloying efficiency and the available magnesium % of the added magnesium alloy decreased thereby. The principal reactions are presumed to be as follows:
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