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Intrinsic thresholds in polycrystalline Udimet 720

Intrinsic thresholds in polycrystalline Udimet 720
Intrinsic thresholds in polycrystalline Udimet 720
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).
polycrystal, mechanical properties, rupture, microstructure, crack propagation, fatigue crack, stress intensity factor, crack closure effect, superalloy, nickel alloys, transition metal alloys
0267-0836
281-287
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Gale, W.F.
7dd9f863-75c8-4bf8-9d49-250ce696eb3e
King, J.E.
0d385133-f5e3-430f-80fd-37864be44b50
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Gale, W.F.
7dd9f863-75c8-4bf8-9d49-250ce696eb3e
King, J.E.
0d385133-f5e3-430f-80fd-37864be44b50

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.

Record type: Article

Abstract

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).

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More information

Published date: 1993
Keywords: polycrystal, mechanical properties, rupture, microstructure, crack propagation, fatigue crack, stress intensity factor, crack closure effect, superalloy, nickel alloys, transition metal alloys
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 43056
URI: https://eprints.soton.ac.uk/id/eprint/43056
ISSN: 0267-0836
PURE UUID: 3d07edbf-d6d3-452a-ad46-45ede608ff82
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 10 Jan 2007
Last modified: 14 Mar 2019 01:53

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