CAST PRODUCT HAVING ALUMINA BARRIER LAYER

摘要

Disclosed is a cast product which is used in a high-temperature atmosphere and comprises: a heat-resistant alloy cast body that contains, in mass%, 0.05-0.7% of C, more than 0% but 2.5% or less of Si, more than 0% but 3.0% or less of Mn, 15-50% of Cr, 18-70% of Ni, 2-4% of Al, 0.005-0.4% of a rare earth element, and 0.5-10% of W or 0.1-5% of Mo, with the balance made up of Fe and unavoidable impurities; and a barrier layer that is formed on the surface of the cast body, said surface being brought into contact with a high-temperature atmosphere. The barrier layer is an Al2O3 layer having a thickness of not less than 0.5 µm, and not less than 80% by area of the outermost surface of the barrier layer is composed of Al2O3. In the interface between the Al2O3 layer and the cast body, Cr-based particles having a higher Cr concentration than the alloy matrix are dispersed.