THIXOCAST CASTING MATERIAL, PROCESS FOR PREPARING THIXOCAST SEMI-MOLTEN CASTING MATERIAL, THIXOCASTING PROCESS, FE-BASED CAST PRODUCT, AND PROCESS FOR THERMALLY TREATING FE-BASED CAST PRODUCT

摘要

A thixocast casting material is formed of an Fe-C-Si based. alloy in which an angle endothermic section due to the melting of a eutectic crystal exists in a latent heat distribution curve and has a eutectic crystal amount Ec in a range of 10 % by weight Ec 50 % by weight. This composition comprises 1.8 % by weight .ltoreq. C .ltoreq. 2.5 % by weight of carbon, 1.4 % by weight .ltoreq. Si .ltoreq. 3 % by weight of silicon and a balance of Fe including inevitable impurities.