Cost Effective Machining of New Superalloy AD730 Parts with Enhanced Durability for Gas Turbines

Purpose and goal

AD730 is a novel high temperature material that offers better combination of high temperature properties and cost compared to other C&W superalloys for gas turbines and aero engines. The aim of the project was to generate knowledge and data needed for effective machining of AD730® turbine discs with enhanced durability. The project was divided into two stages with respective deliverables. All six work packages in each stage were successfully implemented. It can be concluded that all the project goals are fulfilled.

Expected results and effects

The machinability of AD730® was determined with reference to IN718. Suitable cutting process parameters, tool materials and geometry together with achievable surface integrity of machined parts were determined for several machining processes. The fatigue performance of machined AD730® and the effect of post surface treatments were characterized and correlated to the surface properties of the parts. The achieved results will facilitate effective machining of AD730® parts and eventual implementation of AD730® is expected to increase gas turbines’ efficiency.

Planned approach and implementation

The project has been carried out through close collaborations between the project partners. The responsibility and participation of the partners have been clearly specified for each of the twelve work packages in the project. Physical and on-line project meetings, which also involved the material supplier, to plan project tasks, to work on obtained results and to deal with unexpected issues have been important for the successful collaboration to implement the project tasks.