Research on influence of typical microstructure characteristics of Ni base single crystal on creep rupture and deformation analysis of turbo blade

Considering the influence of typical microstructure characteristics on creep performance, a series of UM-F single crystal alloys which had similar element components but different microstructures were used to analyze the relationship between creep life and microstructure characteristics of Ni base single crystal. Three main factors were proposed: misfit, volume fraction of precipitate and maximum matrix channel width. The Microstate parameter Y_micro was established to estimate the deformation state of the materials. The linear relationship between the initial value of microstate parameter Y₀ and creep life under a certain temperature/load was affirmed. By analyzing the high temperature region of turbo blade using the material parameters of DD 3, the creep deformation and the life prediction of the critical points of blade were obtained and the result closed to the test.