| About this Abstract |
| Meeting |
2016 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
The Effect of Composition upon the Precipitation of the Sigma Phase in a Model Nickel-base Superalloy |
| Author(s) |
, Nicholas G Jones, Howard J Stone |
| On-Site Speaker (Planned) |
|
| Abstract Scope |
Polycrystalline nickel-base superalloys are the material of choice for turbine discs in gas turbine engines. However, the continuing desire for engines with greater efficiency requires these components to operate at higher stresses and temperatures, beyond the capability of current alloys. New nickel-base superalloys that are capable of tolerating these service conditions require increased strengthening of the gamma prime precipitates and the gamma matrix. Improving the performance of the gamma matrix conventionally requires elevated concentrations of Cr for environmental resistance and Mo or W for solid solution strengthening. However, it is these very elements that increase the propensity for the precipitation of the sigma phase, which is detrimental to alloy properties. Understanding sigma phase precipitation with respect to alloying of Cr, Mo and W is therefore important for the design of new nickel-base superalloys and has been studied through a series of model alloys with varying levels of these elements. |
| Proceedings Inclusion? |
Planned: A print-only volume |