Abstract
The low cycle fatigue behaviour of shallow notch specimens of [001] superalloy single crystals was studied at 650 °C. Three notch orientations were used for CMSX 2 alloy and only one for MAR-M200 alloy. Crack initiation and growth were monitored using potential drop measurements and a plastic replication technique. A very large scatter in fatigue life was observed and no clear notch orientation dependence of fatigue life could be discerned. Cracks initiate at casting micropores in CMSX 2 and carbides in MAR-M200. These results are discussed using fractographic and metallographic observations. Emphasis is placed on microcrack growth and on the size and location of the initiating defect.
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