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Titre du document / Document title

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

Auteur(s) / Author(s)

LOO-MORREY M. (1) ; REED P. A. S. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Engineering Materials, University of Southampton, ROYAUME-UNI

Résumé / Abstract

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.

Revue / Journal Title

Materials science and technology    ISSN  0267-0836   CODEN MSCTEP 

Source / Source

2000, vol. 16, no2, pp. 133-146 (27 ref.)

Langue / Language

Anglais

Editeur / Publisher

Maney, London, ROYAUME-UNI  (1985) (Revue)

Mots-clés anglais / English Keywords

Crack propagation

;

Anomaly

;

Fine grain structure

;

Rupture

;

Fractography

;

Fatigue test

;

Notched test piece

;

Propagation velocity

;

Shear

;

Superalloy

;

Nickel base alloys

;

Application

;

Gas turbine

;

Experimental study

;

Mots-clés français / French Keywords

Propagation fissure

;

Anomalie

;

Structure grain fin

;

Rupture

;

Fractographie

;

Essai fatigue

;

Eprouvette entaillée

;

Vitesse propagation

;

Cisaillement

;

Superalliage

;

Alliage base nickel

;

Application

;

Turbine gaz

;

Etude expérimentale

;

Udimet 720

;

Alliage Ni55Cr18Co15Ti5Al3Mo3W1

;

Al Co Cr Mo Ni Ti W

;

Mots-clés espagnols / Spanish Keywords

Propagación fisura

;

Anomalía

;

Estructura grano fino

;

Ruptura

;

Fractografía

;

Ensayo fatiga

;

Probeta entallada

;

Velocidad propagación

;

Cizalladura

;

Superaléación

;

Aplicación

;

Turbina gas

;

Estudio experimental

;

Localisation / Location

INIST-CNRS, Cote INIST : 20742, 35400008621527.0040

Nº notice refdoc (ud4) : 1253027



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