|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Crystal Plasticity Finite Element Modelling of Fatigue Crack Nucleation from Non-metallic Inclusions in PM Nickel Based Superalloy
||Tiantian Zhang, Jun Jiang, Barbara Shollock, Ben Britton, Fionn Dunne
|On-Site Speaker (Planned)
Non-metallic inclusions are inevitably introduced during the manufacturing process of nickel superalloys. Such defects result in both detriment to component life and to scatter in fatigue life. Therefore, a mechanistic analysis of fatigue crack nucleation from inclusions is important for engine manufacturers.
A micromechanical study of the effects of inclusions on fatigue crack nucleation has been done using crystal plasticity (CP) finite element modelling. The localisation of strain and the local ratcheting which occur were found to be very significant and of direct relevance to the micromechanical basis of defect nucleation. Plastic strain and residual stress were measured by high angular resolution EBSD (HR EBSD), and high spatial resolution Digital Image Correlation (HR DIC). CP model predictions were compared with the experimental measurements and good agreement obtained. The combined and rich data obtained from DIC, EBSD and CP are utilized to investigate mechanistic models for fatigue crack nucleation.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)