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Effect of gamma prime depletion on creep behaviour of a nickel base superalloy (Inconel alloy X-750)

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Abstract

Specimens of a nickel base superalloy were exposed to air at 1423 K to study the effect of gamma prime depletion in the near-surface region on the creep behaviour of the alloy. The results showed that the gamma prime depletion in the air-exposed specimens caused a weakening effect, leading to enhanced creep rate. Kachanov’s damage parameterf was determined and was found to be 0·5 indicating that the near-surface region, comprising of surface oxide, grain boundary oxide and gamma prime depleted region, carried a small fraction of the applied stress. It is further shown that the damaging effect is more pronounced in thinner specimens.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, 500 058, Kanchanbagh, Hyderabad, India

    M C Pandey & D V V Satyanarayana

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  1. M C Pandey
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  2. D V V Satyanarayana
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Pandey, M.C., Satyanarayana, D.V.V. Effect of gamma prime depletion on creep behaviour of a nickel base superalloy (Inconel alloy X-750). Bull. Mater. Sci. 19, 1009–1015 (1996). https://doi.org/10.1007/BF02744633

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  • DOI: https://doi.org/10.1007/BF02744633

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