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A fracture mechanics study of creep induced embrittlement

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Abstract

Methods which have been used to study creep induced embrittlement are reviewed and a new method based on the use of fracture mechanics concepts is proposed. It is suggested that fracture toughness, as measured by J IC, be used to follow the embrittlement process. Exploratory tests are conducted on a Cr−Mn steel and the results are presented to illustrate the procedure.

The implications of a time dependent fracture toughness with regard to critical crack length are examined. The effect on a characterization of the conditions for a transition from stable creep crack growth to unstable crack extension is also discussed.

Résumé

On passe en revue les méthodes qui ont été utilisées pour étudier la fragilisation en cours de fluage et une nouvelle méthode basée sur l'utilisation des concepts de mécanique de rupture est proposée. On suggère que la ténacité à la rupture, mesurée par JIc, soit utilisée pour suivre le processus de fragilisation. Des essais exploratoires sont conduits sur un acier au Cr−Mn et les résultats sont présentés de manière à illuster la procédure.

Les implications d'une ténacité à la rupture dépendante du temps en fonction de la longueur de fissures critiques sont examinées. On discute également de la manière de tenir compte dans une caractérisation de la transition entre la croissance stable d'une fissure de fluage et son extension instable.

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Authors and Affiliations

  1. Georgia Institute of Technology, 30332, Atlanta, Georgia, USA

    R. L. Carlson

  2. McDonnell Douglas Corp., 11001, Houston, Texas, USA

    H. C. Lo

Authors
  1. R. L. Carlson
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  2. H. C. Lo
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Carlson, R.L., Lo, H.C. A fracture mechanics study of creep induced embrittlement. Int J Fract 18, 145–157 (1982). https://doi.org/10.1007/BF00019639

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