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Investigation on low cycle fatigue of nickel‐based single crystal turbine blade in different regions
Author(s) -
Li Z.,
Wen Z.,
Gao H.,
Wu Y.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201700187
Subject(s) - materials science , turbine blade , superalloy , fracture (geology) , scanning electron microscope , microstructure , cleavage (geology) , metallurgy , low cycle fatigue , composite material , yield (engineering) , single crystal , nickel , turbine , crystallography , mechanical engineering , engineering , chemistry
Low cycle fatigue experiments of nickel‐based single crystal superalloy miniature specimens were carried out at 760 °C/1000 MPa and 980 °C/750 MPa. According to testing results, low cycle fatigue life is dependent on sampling position of turbine blade under same test conditions. Fracture surface morphology and longitudinal profile microstructure indicated that the fracture mechanism transformed from cleavage fracture to ductile fracture with the changing of medium temperature to high temperature due to the particle cutting at yield stress intensity. The scanning electron microscopy observation of original material demonstrated that the smaller precipitate size of samples have a shorter fatigue life. Meanwhile, the constitutive model considering size effect was built based on the crystal plastic theory. The finite element analysis demonstrated that the smaller precipitate size could dramatically reduce the plastic deformation suffering the same cycle loading.