The effect of minimum dwell cycles on the environmental and fatigue response of RR1000
1 Materials Research Centre, School of Engineering, Swansea University, Singleton Park, Swansea, SA2 8PP, UK
2 Rolls-Royce plc, PO Box 31, Derby, DE24 8BJ, UK
3 Department of Materials, Royal School of Mines, Imperial College, Prince Consort Road, London, SW7 2AZ, UK
4 School of Materials, University of Manchester, Grosvenor St, Manchester, M13 9PL, UK
a Corresponding author: email@example.com
Minimum dwell fatigue testing of nickel based superalloy FG RR1000 at 650 ∘C has led to significant reductions in fatigue life. The reduction in fatigue life under minimum dwell fatigue has been caused by relatively early and multiple crack initiation events from a highly oxidised surface. The depth of oxidation damage, in the present circumstances achieved under cyclic loading at 650 ∘C, appeared similar to previous stress free isothermal exposure studies conducted on RR1000 but at higher temperature/shorter duration suggesting an enhancement in oxidation due to applied stress. Surface oxidation and crack initiation were clearly resisted under the baseline loading cycle despite being exposed for similar periods of exposure time. To understand the respective effects of the environment and minimum dwell period, vacuum fatigue and hold time oxidation tests have been completed.
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