why we can not do direct aging heat treatment after homogenizing heat treatment on Fe-Ni superalloys? what is the purpose of (Solid) solution treatment which is different then aging?
The purpose of homogenization treatment is different from solution treatment and therefore heat treatment temperature and times of the two treatments may differ. While through homogenization treatment we want to get rid of coring or solute concentration gradient in a cast alloy, in solution treatment our aim it to get all the solutes needed for precipitation hardening into the solution so that we can achieve maximum precipitate volume fraction during aging treatment.