Abnormal grain growth in Nimonic PE16

Abstract

The grain growth characteristics of Nimonic PE16, cold worked by 5 to 40% followed by annealing for 30 min at 1050 to 1275°C, have been investigated. Increasing the level of prior deformation lowered the critical temperature for the onset of secondary recrystallization and increased the number of grains able to grow abnormally. It is considered that grain boundary migration was restricted owing to pinning of the boundaries by Ti(C, N) particles and that the primary recrystallized grain size was initially greater than the limiting grain size for normal grain growth; secondary recrystallization was then initiated when particle coarsening allowed grains which were large in relation to the average size to become unpinned.