|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Tailoring the Properties of a Ni-based Superalloy via Modification of the Forging Process: An ICME Approach to Fatigue Performance
||John Rotella, Martin Detrois, Sammy Tin, Michael D Sangid
|On-Site Speaker (Planned)
Beside compositional design, changes in the manufacturing process parameters can have a dramatic effect on the resulting material properties. In this work, a fatigue model is used to identify microstructural features that promote enhanced fatigue life for turbine disc applications, specifically high twin boundary density. Via process modeling, grain boundary engineering (GBE) is adapted to isothermal forging, thus resulting in a process deformation mechanism map. Small-scale forgings of RR1000 were produced in the conventionally processed and GBE conditions with fine and coarse grain sizes that resulted in twin densities and grain sizes in agreement with the desired microstructural attributes. High resolution digital image correlation was implemented to investigate the distribution of strain accumulation between the conventionally produced and GBE variant, as well as GBE’s effect on slip band length. Lastly, the slip-grain boundary interactions will be presented for both sets of material, as it pertains to the resulting mechanical behavior.
||Planned: Supplemental Proceedings volume