Abstract
Single crystal ~ineairfoilscastingintegritydependsonstructuresas well as inherent defects. Pee Airfoils, in conjunction with the Air Force MANIEUI program and GE Aircraft Engines (GFAJZ), correlatedthe solidification conditions to the microstructures and defects of single crystal castings. !Ihe approach cmnbined finite-element therm1 analysis and experimental results. Simple-shapedcylinderswerefirstcastandmodeled to establish a defects prediction map. Solidification conditions of complex-shaped airfoils were then modeled, to predict the evolution of casting microstructures as well as the using the pre-established defects map. occurrence of casting defects by Cmparisonofmdelpredicztionsto experimental inspection results show that finite-elementmdelingisan effective tcol for understanding the solidification sequence and predictiq the miorostruoture, defects and chemistry variation of investment cast, cmplex-shaped, single crystal turbine airfoils. Superalloys 1992 Edited by S.D. Antolovich, R.W. Stusrod, R.A. MacKay, D.L. Anton, T. Khan, R.D. Kissinger, D.L. Klarstmm The Minerals, Metals & Materials Society, 1992
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