Thixocast casting material, process for preparing thixocasting semi-molten casting material, thixocast 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<=C<=2.5% by weight of carbon, 1.4% by weight<=Si<=3% by weight if silicon and a balance of Fe including inevitable impurities.