Recrystallization and texture development in dispersion-strengthened nickel-base superalloys

The recrystallization heat treating cycle is shown to be a critical factor in determining the final texture of an extruded and hot-rolled yttria-dispersed superalloy. It appears that recrystallization in such systems is not a dynamic process,i.e., no recrystallization occurs during hot-rolling operations. Further, pole figures obtained from fully recrystallized specimens demonstrate that the temperature from which the recrystallization treatment is started determines the final crystallographic orientation of the system. (110){001} and (110){110} texture will be developed only if the cycle is started within a specific temperature range; initial temperatures either too low or too high promote other orientations. CLAUDIA J. BURTON, formerly Graduate Student, Columbia University