Thermo-mechanical fatigue of Ni-base superalloy

Purpose and goal

In this work we aimed to understand the variation in microstructure achieved within the processing heat treatment window for Haynes 282 and its effect on the mechanical properties. These results can have a big impact on the potential use of this alloy in critical applications such as in aero engines. The purpose of this project to create a fundamental understanding around this new material in terms of its heat treatment and microstructure and properties was achieved and will be further extended in NFFP 7.

Expected results and effects

From investigation of Haynes 282 sheet material which was uniform in microstructure from the start, it was observed that the first step of heat treatment (solution heat treatment) had insignificant influence on mechanical properties. However, during the second step of heat treatment (carbide stabilization step), changing process parameters affects both the microstructure and mechanical properties considerably. The knowledge gained in the project can be used to optimize the heat treatment process and bring the material to the next TRL levels at the company.

Planned approach and implementation

This project was a close collaboration between GKN and Chalmers University. The work also involved internal collaborations within Chalmers between the departments of Applied Mechanics (with a twin PhD) as well as with Department of Physics (Atom probe analysis).