High temperature fatigue crack propagation in Nickel-based superalloys

The use of wrought fine grained superalloys are sometimes limited by their susceptibility to fast crack growth during dwell times. Aspects of this phenomena is studied in this project.

Due to increasing demands on efficiency, and cyclic capabilities etc, life modelling in general, and damage tolerant design in particular, become increasingly important in the analysis and design of existing and future gas turbines. This project concerns the question of how thermo-mechanical cycling in combination with dwell times at high temperatures governs the fatigue crack propagation behaviour of gas turbine materials. Special emphasis is placed on the effect of load cycle shapes (e.g.such as initial overloads and transient temperature cycles) and propagation of short cracks (e.g. from defects) in the low stress intensity range.

Industrial partners: Siemens Industrial Turbomachinery and GKN Aerospace
Financing: Swedish Energy Agency

Research
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