Process variables determining the dimensional and metallurgical properties of directionally solidified,cored turbine blades produced by investment casting of super-alloys

The investment casting process for the manufacture of directionally solidified, cored turbine blades is described. The dimensional and metallurgical properties of blades produced by this process is subject to variations which can result in long lead times in development and scrap during production. The process variables that determine the dimensional and metallurgical properties have been identified and classified in order of importance. The objective of the research is the formation of a database of process variables that can be used as a basis for control of the casting process and for predicting the final geometry as a result of the process.