Abstract
A new grain refining casting process “Kawasaki Microcast Process” for producing high strength and low cost turbine disks has been developed. This process ensures extremely grain refined microstructure as fine as ASTM No. 3 to 6 and higher tensile strength than conventional casting processes. Even high alloyed superalloys which are usually difficult to forge can be forged. IN792+Hf is the most preferable alloy for this process in all alloys tested. If cast by this process, IN792+Hf has tensile properties as high as and rupture properties higher than those of power forged disk materials.
