CASTING MATERIAL FOR THIXOCASTING, METHOD FOR PREPARING PARTIALLY SOLIDIFIED CASTING MATERIAL FOR THIXOCASTING, THIXO-CASTING METHOD, IRON-BASE CAST, AND METHOD FOR HEAT-TREATING IRON-BASE CAST

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 of silicon and a balance of Fe including inevitable impurities.