Investigation of an abnormality in fatigue crack growth curves-the Marci Effect

The Marci Effect does not appear in the nickel base superalloy IN100. Among the alloys investigated so far, only titanium base alloys show the Marci Effect. In Ti-6246, the abnormal crack growth effect occurs roughly above K sub max =21MParoot m which is 72% of K sub IC . The influence of room tempe...

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Veröffentlicht in:	Scripta Materialia 1998-05, Vol.38 (12), p.1803-1810
Hauptverfasser:	Lang, M., Hartman, G.A., Larsen, J.M.
Format:	Artikel
Sprache:	eng
Schlagworte:	ALLOY-IN-100 ALUMINIUM ALLOYS Applied sciences Condensed matter: structure, mechanical and thermal properties CRACK PROPAGATION Exact sciences and technology FATIGUE Fatigue, brittleness, fracture, and cracks MATERIALS SCIENCE Mechanical and acoustical properties of condensed matter Mechanical properties of solids Metals. Metallurgy MOLYBDENUM ALLOYS Physics STRESS INTENSITY FACTORS TIN ALLOYS TITANIUM BASE ALLOYS ZIRCONIUM ALLOYS
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Beschreibung
Zusammenfassung:	The Marci Effect does not appear in the nickel base superalloy IN100. Among the alloys investigated so far, only titanium base alloys show the Marci Effect. In Ti-6246, the abnormal crack growth effect occurs roughly above K sub max =21MParoot m which is 72% of K sub IC . The influence of room temperature creep seems to be low since no change in the crack grow rate was observed due to a change in frequency from 50-10 Hz. Tests with greater variation of frequency would be necessary to clarify this point. The loading history characteristic for the K sub max -constant test is not a necessary condition for the occurrence of the Marci Effect.
ISSN:	1359-6462 1872-8456
DOI:	10.1016/S1359-6462(98)00120-1