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Anomalous crack shape development (tear drop cracking) in turbine disc material Udimet 720

Loo-Morrey, M. and Reed, P.A.S. (2000) Anomalous crack shape development (tear drop cracking) in turbine disc material Udimet 720 Materials Science and Technology, 16, (2), pp. 133-146.

Record type: Article


An unusual crack growth mechanism has been observed in fine grained Udimet 720 at moderate temperatures. Fracture surfaces consisting of a tear drop shaped region of stage II crack growth bounded by regions of shear crack growth have been observed above room temperature. The current study investigates the effect of temperature, environment, and specimen geometry on the tear drop cracking phenomenon. Vacuum conditions are found to retain tear drop cracking behaviour at higher temperatures than observed by other workers. Tear drop cracking has been established in a number of specimen geometries and it is demonstrated that further analysis of the effects of crack tip shielding during this macroscopically tortuous crack growth is required to fully evaluate the effects of such crack growth behaviour on component lifing.

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Published date: 2000
Keywords: temperature, growth, microstructure, thresholds, deflection, fracture, alloy
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 43064
ISSN: 0267-0836
PURE UUID: e852af2f-1375-468b-8ab1-84bd8d6be21a
ORCID for P.A.S. Reed: ORCID iD

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Date deposited: 10 Jan 2007
Last modified: 17 Jul 2017 15:20

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Author: M. Loo-Morrey
Author: P.A.S. Reed ORCID iD

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