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Ni-superalloy, fatigue crack propagation

By University of Cambridge DoITPoMS and University of Cambridge Department of Materials Science and Metallurgy Prof T W Clyne


This sample shows fatigue crack propagation in Udimet 720, a nickel-base superalloy. To improve its high temperature mechanical properties Udimet 720 utilises a strengthening mechanism, known as order hardening. There is a large volume fraction of coherent γ' precipitates in the γ matrix. As a fatigue crack propagates through the superalloy there is a plastic region in front of the crack tip.

Topics: alloy, fatigue, fracture, metal, nickel, order hardening, doitpoms, university of cambridge, micrograph, corematerials, ukoer, Engineering, H000
Publisher: University of Cambridge
Year: 2010
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Provided by: Jorum Open
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