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Dissolution of the γ′ phase in a nickel base superalloy at equilibrium and under rapid heating |
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| Authors: | M Soucail and Y Bienvenu |
| Affiliation: | aO.N.E.R.A., Direction des Matériaux, B.P. 72, 92322 Chátillon, France bEcole des Mines de Paris, Centre des Matériaux, B.P.87, 91003 Evry Cedex, France |
| Abstract: | Dissolution of the γ′ phase in a PM superalloy Astroloy was studied at equilibrium and under rapid heating. The ‘solvus’ temperature of primary and secondary γ′ precipitates was determined experimentally. The most prominent feature concerns the large departure from equilibrium for the dissolution of the γ′ precipitates during rapid heating and this departure depends on the initial size of the precipitates. A model for γ′ dissolution during fast thermal cycling is proposed. |
| Keywords: | Friction welding Nickel base superalloy γ′ phase dissolution |
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