| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
|
| Presentation Title |
A Resistivity-based Method for Measuring Precipitate Formation and Dissolution in a Nickel-base Superalloy |
| Author(s) |
David M. Collins |
| On-Site Speaker (Planned) |
David M. Collins |
| Abstract Scope |
The temporal dependence of γ′ dissolution in the polycrystalline Ni-base superalloy RR1000 has been studied with implications to thermo-mechanical processing. A resistivity-based method using an electro-thermal mechanical testing (ETMT) has been used to explore the effect of transient and isothermal thermal cycles. This is supplemented by DICTRA numerical models that simulate the diffusion within the γ phase up to the γ/γ′ interface. It is demonstrated that dissolution is affected by heating rate and microstructure, including precipitate size. For numerical simulations that predict constitutional liquation during rapid heating, the width of the computational domain with respect to the γ′ size was found to be a key parameter that controls simulation accuracy. The resistivity-based method also showed that with increasing heating rates, the local γ′ solvus temperature is shifted to progressively higher temperatures. Unless complete dissolution of γ′ occurs prior to subsequent cooling, erroneous interpretations of nucleation undercooling can arise. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Phase Transformations, Copper / Nickel / Cobalt |