Abstract
Morphology change of γ' precipitates in nickel-base superalloy IN-100 prepared by liquid phase sintering and swaging was investigated during recrystallization and creep (1323 K, 66.6 MPa).
The results obtained were as follows:
(1) In the swaged specimens, large-sized and cellular γ' precipitates appeared behind the migrating boundary of recrystallized grains in a similar manner as that in discontinuous precipitation. On the other hand, uniform and fine γ' precipitates appeared in the strain-free specimens subjected to solution treatment after swaging.
(2) The large and cellular γ' precipitated at grain boundaries parallel to the tensile stress axis during creep. However, this orientation became indistinct with decreasing y-grain size.
