|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Influence of Forging Parameters on the Microstructure of Supersolvus Heat Treated Nickel-based Superalloy RR1000
||Kevin Severs, Vikas Saraf, Iain Parr, Thomas Jackson, Mark Hardy
|On-Site Speaker (Planned)
In order to meet the property requirements for Ni-based superalloy RR1000, the thermomechanical processing (TMP) of the alloy must be precisely controlled, typically through isothermal forging and subsequent heat treatment. Historically the alloy had been processed to result in a grain size of approximately 7 microns. In order to increase the crack growth resistance and improve creep performance the alloy can also be given a supersolvus heat treatment to coarsen the grain size. The effect of forging temperature, strain, and strain rate on the grain size of supersolvus heat treated RR1000 was investigated. Through the use of isothermal right circular cylinder and double-cone compression tests, a processing map was developed to generate a grain size of approximately 30 microns after a supersolvus heat treatment. The processing map developed with small scale specimens will be compared to results on full scale forgings manufactured in a production environment.
||Planned: Supplemental Proceedings volume