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Defect Grains in the Melt-Back Region of CMSX-4 Single Crystal Seeds
Superalloys 2004 (Tenth International Symposium)
The nickel-based superalloy CMSX-4 is used commercially to cast single crystal components. During casting, a pre-fabricated seed is used to nucleate the desired orientation. During casting the top portion of the seed is partially melted and this mushy zone is the origin of defect stray grains. A number of seeds cast at Rolls-Royce CRDF that exhibit extensive defect grain formation in the melt-back region have been analysed using optical and electron microscopy techniques. These defect grainsdoi:10.7449/2004/superalloys_2004_719_726 fatcat:4lbpaeg66vdfrpnw4nwsc33oia