Patent ID: 8524016
Filing Date: 2013-09-03
Classification: B22C,B22D,C21D,C22C,F03D,F05B,F16C,Y02E,Y02P

Abstract:
1. A method of making an austempered ductile iron article, comprising: providing a melt of a ductile iron alloy composition; casting the melt into a mold to form a casting, the mold comprising a mold cavity; cooling the casting to an austempering temperature by circulating a coolant through the mold, the coolant circulating within at least one enclosed fluid conduit that is disposed within the mold proximate the mold cavity; wherein cooling comprises solidifying the melt and forming a ductile iron article; and heating the casting to maintain the austempering temperature for an interval sufficient to form an austempered ductile iron article that comprises a microstructure comprising ausferrite.