Abstract
Superalloys are complex alloys of Fe-Ni, Ni, or Co-base compositions. Their microstructure can be quite complex due to the potential for a variety of phases that can be formed by heat treatment or service exposure conditions. The paper presents the use of new metallographic materials to prepare these alloys with emphasis on modern, four- and five-step practices. Different etchants are required to reveal the structure of these alloys properly. Examples will be presented showing the use of different etchants as a function of alloy composition, heat treatment, and microstructural phases.
