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), 133-146.


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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.

Item Type: Article
ISSNs: 0267-0836 (print)
Related URLs:
Keywords: temperature, growth, microstructure, thresholds, deflection, fracture, alloy
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions : University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 43064
Accepted Date and Publication Date:
Date Deposited: 10 Jan 2007
Last Modified: 31 Mar 2016 12:16

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