Abstract
A combination of Gleeble thermo-mechanical physical simulation and analytical electron microscopy techniques was used to study non-equilibrium dissolution mode of an equilibrium phase, δ phase precipitates, during rapid heating in IN 718 superalloy. In contrast to the generally reported complete solid-state dissolution, the result revealed that the precipitates dissolved by liquation reaction, which is pertinent to weldability and hot formability behavior of Nb-bearing nickel-based superalloys.
Acknowledgement
The authors would like to thank Standard Aero Ltd, Winnipeg and NSERC of Canada for the financial support.