|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Abnormal Grain Growth upon Annealing of a Hot-worked Ni-base Alloy
||Michael Fahrmann, David A. Metzler
|On-Site Speaker (Planned)
Abnormal grain growth (AGG) has been observed in cast & wrought and powder metallurgy Ni-base alloys and superalloys as well. In a number of studies, AGG has been associated with small amounts of strain (below the critical strain to cause recrystallization upon annealing), imparted by cold work. We report a case of AGG in a hot-worked small-diameter bar of HAYNES 244 alloy, noting that this phenomenon is not unique to this alloy. The as-forged as well as the various annealed structures were rigorously examined by light microscopy, SEM/EDS, and EBSD. A number of controlled experiments (compression tests) were performed in an attempt to replicate the conditions that triggered AGG in the hot-rolled bar. The results are summarized in a deformation map, and discussed in the context of driving forces (distribution of stored energy) and the Zener pinning pressure exerted by second-phase particles.
||Planned: Supplemental Proceedings volume