Abstract
The transformation behavior of Alloy 718 is affected significantly by the cooling rate. The γ″-phase appears at cooling rates less than 20°C/min and δ-phase appears at grain boundaries as well as the MC type carbides at cooling rates below 5°C/min. The δ-phase nucleates and grows preferentially at grain boundaries, and less preferentially at the MC carbides. The size of the γ″ and δ-precipitates increases consistently with decreasing cooling rate for the given conditions. The hardness varies with the transformation behavior. A hardness peak was noticed for a cooling rate of 5°C/min. The hardness peak corresponded to the maximum volume fraction of γ″ which in turn was strongly affected by the presence of the δ-phase.
| Original language | English |
|---|---|
| Pages (from-to) | 401-405 |
| Number of pages | 5 |
| Journal | Materials Letters |
| Volume | 30 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - Apr 1997 |
| Externally published | Yes |
Keywords
- Alloy 718
- Continuous cooling transformation
- Microstructure
- Nickel base superalloy
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