Abstract
Fatigue in the polycrystalline Ni-base superalloys is discussed, with particular emphasis on modelling the mechanism at the grain and sub-grain scale. The importance of Ni-base superalloys as aeroengine materials is summarised, and indications are given as to where modelling offers potential for further advancements. In the experimental section, there are three parts. The first identifies how at the microstructural scale, the instantaneous rate of fatigue crack growth is governed by the crack path selection mechanism. The second part describes a statistical analysis of i) crack arrests, ii) instantaneous crack growth rates and iii) and their dependence on linear elastic fracture mechanics parameters. It is shown that all fatigue crack growth events occurring at the microstructural scale can be represented by a few statistical distributions. Thirdly, an initial analysis of the underlying slip band and dislocation mechanism of conventional fatigue in Ni-base superalloys is presented.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
