Mg 鑄鉄の凝固過程について

概要

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The authors investigated the solidification process of Fe-C-Mg alloy experimentary comparing with that of Fe-C and Al-Si alloys. The results obtained are as follows; 1) When the hypo-eutectic Fe-C is slowly cooled, primary dendrites of austenite are formed at first, then at eutectic temperature the austenite named SASANOHA structure, which are super saturated with C, develops from the primary dendrites. The super saturated carbon crystallizes out on the axes of SASANOHA as cementite, and this cementite immediatly graphitizes to so-called flaky graphite due to high temperature, 2) As to the hypo-eutectic of Al-Si alloy, the primary dendrites of Al are formed at first, then SASANOHA solid solution of Al develops followed by the separation of Si on the axes of SASANOHA. The final structure is the eutectic Si-needles which corresponds to the flaky graphite in Fe-C alloy. 3) When 6 % of Mg is added to the hypo-eutectic Fe-C alloy, primary austenites crystalize in the form of globule. At eutectic temperature the form of the austenite, which correspond to SASANOHA austenite of Fe-C alloy, are the same to that of primary. Then the super saturated carbon precipitates out in the globular austenites and forms so-called globular graphite.
Japan Foundry Engineering Societyの論文