Fundamentals of Deformation Mechanisms in Polycrystalline Superalloys
Abstract
The project will build a US-UK international collaboration on the deformation (yielding, creep, fatigue) mechanisms in the high-strength nickel-based superalloys used for turbine applications, e.g. for jet engines, and especially the grades used for turbine discs. To ensure the best performance and fuel efficiency targets, temperatures are rising due to technical, commercial and legislative pressures; the rims of the turbine discs are now experiencing temperatures of beyond 800°C in service, a stress of many hundred MPa and become critical regions because the turbine blades are located in them. Two leading groups led by (i) Professor Roger Reed at Oxford–whose expertise relates to alloy design, numerical modelling and manufacturing–and (ii) Professor Mike Mills at The Ohio State University (OSU) – an expert in high resolution microscopy and deformation mechanisms in these materials–will collaborate on the project. The science of the time-dependent deformation mechanisms which are precursors to fatigue failure will be studied on new grades of superalloy which are being designed on both sides of the North Atlantic. The scientific aim will be to better understand the mechanisms of deformation with atomic-scale chemical resolution – using pioneering approaches of OSU – and to build modelling capability for predictive purposes, for which Reed’s group at Oxford is world-leading. The technological aim is to aid in the isolation of better grades of alloy with superior properties; thus impact is anticipated via the modelling-driven design of improved alloys for these applications, so that improved engine technologies can be delivered.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 24, 2019
- Source ID
- FA95501817000
Entities
People
- Roger Reed
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Oxford