Effects of microstructure and lattice misfit on creep life of Ni-based single crystal superalloy during long-term thermal exposure

According to the microstructural evolution during longterm thermal exposure at 1100 ° C, the creep rupture life of Ni-based single crystal superalloys at 980 ° C/270 MPa was evaluated. The microstructure was characterized by means of scanning electron microscopy, X-ray diffraction and related image processing methods. The size of γ ’ precipitates and the precipitation amount of topologically close-packed increased with the increase in thermal...