Alloy Design of Nickel-Base Precipitation Hardened Superalloys

Abstract

A new method of alloy design which consists of theoretical analysis and experimental examination has been applied to development of turbine blade materials of gas turbines.Oianed practical performance of the materials to be developed is settled at the beginning, and property factors affecting practical performance are analysed.Theoretical analysis involves decision of the most promissing alloy type, analysisof structural factors affecting property factors, analysis of production factors affecting structural factors, limitation of the range of the structural factors and computation of effective chemical compositions.In experimental examination, factors which can not be determined through theoretical analysis are investigated and practically valuable alloys are finally selected from the compositions extracted through theoretical analysis.In conclusion, 22 kinds of precipitation hardened nickel base alloys have been developed and the method of alloy design used in this study has been proved to be an effective means to develop complicated alloys.