Intrinsic thresholds in polycrystalline Udimet 720
Reed, P.A.S., Gale, W.F. and King, J.E. (1993) Intrinsic thresholds in polycrystalline Udimet 720. Materials Science and Technology, 9, (4), 281-287.
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The long crack threshold behaviour of polycrystalline Udimet 720 has been investigated. Faceted crack growth is seen near threshold when the monotonic crack tip plastic zone is contained within the coarsest grain size. At very high load ratios R(=P[min]/P[max]) it is possible for the monotonic crack tip plastic zone to exceed the coarsest grain size throughout the entire crack growth regime and non-faceted structure insensitive crack growth is then seen down to threshold. Intrinsic threshold values were obtained for non-faceted and faceted crack growth using a constant K[max], increasing K[min], computer controlled load shedding technique (K is stress intensity factor).
|Keywords:||polycrystal, mechanical properties, rupture, microstructure, crack propagation, fatigue crack, stress intensity factor, crack closure effect, superalloy, nickel alloys, transition metal alloys|
|Subjects:||T Technology > TN Mining engineering. Metallurgy|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||10 Jan 2007|
|Last Modified:||27 Mar 2014 18:27|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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