Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy
作者： C. Yuan , J. T. Guo , H. C. Yang
DOI: 10.1179/026708301125000249
关键词:
摘要: The effects of grain boundary orientation and cyclic load on the creep fracture behaviour directionally solidified superalloy DZ17G have been investigated. results show that has no effect deformation mechanism, but a marked mechanism. mechanism changes from transgranular mode in longitudinal specimens to intergranular failure transverse inclined (45degrees applied stress axis) specimens. Compared with constant load, remarkably reduces life increment frequency, ductility. After careful examination transient response following changes, it is suggested an intrinsic softening occurred during unloading, which accelerates rate subsequent reloading, accumulation this finally acceleration. contribution anelasticity also discussed.
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