Hot isostatic pressing to remove porosity & creep damage

The creep life of components operating at high temperature is frequently limited by the accumulation of cavities and voids on grain boundaries. In addition, the structural integrity of castings is degraded by micropores resulting from shrinkage or gas exsolution during solidification. All such ‘defe...

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Bibliographic Details
Published in:Materials in engineering 1982, Vol.3 (3), p.461-469
Main Authors: Stevens, R.A., Flewitt, P.E.J.
Format: Article
Language:English
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Summary:The creep life of components operating at high temperature is frequently limited by the accumulation of cavities and voids on grain boundaries. In addition, the structural integrity of castings is degraded by micropores resulting from shrinkage or gas exsolution during solidification. All such ‘defects’ can be healed by heat treatments under hydrostatic pressure of inert gas (Hot Isostatic Pressing, HIP). Here we consider the theoretical contribution of hydrostatic pressure to the sintering of cavities and pores, and show how parametric methods may be used to predict the required conditions. Experimental results are presented for the healing of cavities and pores in a dilute nickel alloy and a nickel-base superalloy, and it is shown how such procedures may be used to improve or regenerate creep properties.
ISSN:0261-3069
DOI:10.1016/0261-3069(82)90112-1