Effects of Oxygen for Structure of Gray Cast Iron by Vacuum Depressurization Processing

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  • lin Wang
    Graduate School of Engineering, Muroran Institute of Technology
  • Momono Tadasi
    Department of Engineering, Muroran Institute of Technology

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Other Title
  • 減圧処理による片状黒鉛鋳鉄の組織に及ぼす酸素の影響
  • ゲンアツ ショリ ニ ヨル ヘンジョウ コクエン チュウテツ ノ ソシキ ニ オヨボス サンソ ノ エイキョウ

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  In order to clarify the effects of oxygen on graphitization in cast iron, various pig irons were melted in air and held for various duration under vacuum ranging from 1 Torr to 5 Torr at 1773 K to 1823 K. Molten iron was cast into green sand mould in air, and round bar specimens were made. Fractures and microstructures of round bar affected by oxygen were studied.<br>  The total oxygen and that dissolved in molten iron were measured. In the first stage of the decompression process, the dissolved oxygen content had a tendency to increase slightly, and decreased as low as 2 massppm afterwards. As the processing time increases, the flake graphite structure changed from type A (or type D plus chill structure) to an increase in the chill structure to inverse chill, and finally to the type D graphite structure (without chill). The molten iron of D which was held for 30 minutes under low pressure was added with 3% Fe-Si-Ca for inoculation. The graphite in irons spheroidized easily.

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