The Research and Application of Spray Formed Superalloys

Spray forming is a kind of near-net shape rapid solidification technology.In this paper the research and application of spray formed superalloys are reviewed.The spray formed superalloy billets have the characteristics of no macro-segregation,homogeneous and fine structure,good hot workability as well as cost advantages.Great progress has been made in the spray forming technology including clean metal spray forming(CMSF) and clean metal nucleated casting(CMNC).The applications of spray formed superalloys are mainly focused on tubes,rings and discs.Finally the microstructure of spray formed turbine disk superalloy FGH96 is simply investigated in this paper.