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).

Item Type: Article
ISSNs: 0267-0836 (print)
Related URLs:
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
ePrint ID: 43056
Accepted Date and Publication Date:
Date Deposited: 10 Jan 2007
Last Modified: 31 Mar 2016 12:16

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