Patent ID: 8286692
Filing Date: 2012-10-16
Classification: B22D,C22B

Abstract:
1. A method for reducing interstitial elements in alloy castings, at least one of said interstitial elements being selected from a group consisting of hydrogen, carbon, nitrogen, boron and argon, said method comprises the steps of: pouring a melted alloy for formation of a casting; cooling said alloy, while simultaneously heating one or more spots at a surface of said casting, said heating being provided to produce an increasing temperature gradient to be directed toward said one or more spots at the surface of the casting; and maintaining said one or more spots of the casting at an elevated temperature higher than a temperature of the remaining surface and interior of the casting, said elevated temperature being maintained until the temperature of any part of the casting different from said one or more spots has decreased below a critical temperature of approximately 400° C., so that in said step of cooling a flux of the interstitial elements is directed toward said one or more spots and away from the core of the casting.