Abstract
Creep-fatigue crack growth behaviour of a nickel-based powder metallurgy superalloy has been investigated. Experiments were conducted at 750 °C with various dwell times. Results show that dwell time induced creep damage is significant by transforming a transgranular dominating cracking mode into a completely intergranular one. The observed dependence of crack growth rate on the dwell time and Δ. K is complex indicating that the interaction between creep and fatigue is significant. Therefore, a factor reflecting the degree of the interaction was proposed to help modelling the creep-fatigue crack growth rates. The results are encouraging.
| Original language | English |
|---|---|
| Pages (from-to) | 1058-1066 |
| Number of pages | 9 |
| Journal | Engineering Failure Analysis |
| Volume | 18 |
| Issue number | 3 |
| DOIs | |
| State | Published - Apr 2011 |
Keywords
- Crack growth rate modelling
- Creep-fatigue interaction
- Dwell time
- Nickel based superalloys
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