2001 Volume 42 Issue 6 Pages 1135-1138
The effect of melt undercooling on the γ′ precipitation is investigated in nickel-based superalloy by employing the method of molten salt denucleating combined with thermal cycles. The application of SEM and TEM technique allows to further confirm and interpret γ′ formation mechanism here. In connection with the classical nucleation theory, it is found that not only the size of precipitated γ′ but its distribution in the as-solidified structure is also drastically influenced by the melt undercooling.