CRYSTALLOGRAPHIC FATIGUE CRACK GROWTH IN NIMONIC AP1 |
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| Authors: | J E KING |
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| Affiliation: | Formerly: Department of Metallurgy and Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ Now: Department of Metallurgy and Materials Science, University of Nottingham, University Park, Nottingham NG7 2RD |
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| Abstract: | Recently a controversy has developed over whether crystallographic crack growth near threshold in Ni-base superalloys occurs along {111} slip planes or {100} planes at room temperature. In this work on Nimonic API crack propagation is shown to occur on both {100} and {111} planes. The most common facet plane is {111} and this is the only orientation observed at the lowest stress intensities, but at higher stress intensities occasional {100} facets are also produced. This behaviour is compared with similar results in aluminium alloys. |
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