Influence of pre-compression on tensile creep properties of a single crystal nickel-base superalloy

Acta Metall Sin

2007, Vol. 42

Issue (1): 47-52 DOI:

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Influence of pre-compression on tensile creep properties of a single crystal nickel-base superalloy

shui li

沈阳理工大学;沈阳工业大学

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shui li. Influence of pre-compression on tensile creep properties of a single crystal nickel-base superalloy. Acta Metall Sin, 2007, 42(1): 47-52 .

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Abstract ABSTRACT After P-type rafted structure was obtained by compressive creep of a nickel base single crystal superalloy with [001] orientation, creep tests were performed to examine in more detail the relative creep behavior of rafted (pre-compression) and cuboidal (as-heat treated) γ’ microstructures. The experiments show that, at 800℃ and 600MPa, the alloy with the P-type structure has both much higher strain of primary creep and steady state creep rate, and rupture lives are shorter. TEM examination of the microstructures of the P-type structure indicates that, in addition to {111}<110>-slip system operated in γ matrix, the γ’ precipitates are cut by some superlattice dislocations and a few stacking fault. At low stress of 200MPa and temperature range from 980℃ to 1020℃, the glide-climb process along γ/γ’ interfaces is impeded most efficiently by P-type rafted structure, the alloy exhibits a lower minimum creep rate and longer rupture lives. It is deduced that the tensile creep strength of the alloy is improved by suitable pre-compression treatment.

Key words: Ni-base single crystal superalloy tensile creep pre-compression treatment dislocation

Received: 17 May 2006

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