Simulation of gamma ' Precipitation Kinetics in a Commercial Ni-Base Superalloy

摘要

The ability to accurately simulate the precipitation kinetics of gamma' and other strengthening phases in Ni-base superalloys is of great interest to industry. Several commercial simulation tools such as TC-PRISMA (Thermo-Calc, Sweden) and PanPrecipitation (Computherm, USA) have been made available in recent years. This paper reports the outcome of a validation study on wrought Ni-base superalloy HAYNES (R) 282 (R) alloy for two scenarios of commercial interest: (1) the precipitation of gamma' during continuous cooling, and (2) the precipitation of gamma' during two-step aging. The simulation results are validated against experimental data. Any discrepancies are discussed in the context of the uncertainty in key material properties (such as interfacial energies), model assumptions, and experimental errors.