Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 32, Issue 5, Pages 401-406Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2016.1148227
Keywords
Ni-based superalloys; Oxidation; Dynamic embrittlement; Crack tip; Localised deformation
Funding
- EPSRC - DTP [EP/K027271/1, GR/J34309/01]
- QinetiQ
- Engineering and Physical Sciences Research Council [EP/K027271/1] Funding Source: researchfish
- EPSRC [EP/K027271/1] Funding Source: UKRI
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Ni-based superalloys in turbine disc applications face increasing susceptibility to oxygen-assisted fatigue crack propagation due to increased turbine entry temperatures. The continued lack of understanding of the interplay between the factors operating during oxygen-assisted fatigue crack propagation limits: (1) development of lifing methodologies to accurately predict the fatigue performance of disc alloys/components and (2) associated disc alloy developments. An underpinning requirement to better understand the role of oxygen is to characterise the process of oxygen diffusion in the localised stress/strain state at the crack tip, which is related closely to microstructural features. The link between three-dimensional crack tomography, crack propagation rate and oxygen-related attack needs to be established. Quantitative models which include the interaction between fatigue-creep-oxygen attack need further development.
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