Abstract
The damage to the creep and room-temperature tensile properties of Nimonic 115* resulting from prior creep deformation (usually to the early tertiary stage) at 1123 K has been shown to be recoverable by heat-treatment. Such recovery is possible at 1293 K, without detectable change in the size and distribution of either γ‘ or carbide phases. Heat treatment at 1373 K which dissolves both phases must be followed by controlled reprecipitation to recover the original properties. Using the former treatment the creep properties could be restored and the life considerably extended by repetitive creep/anneal cycles. This extension of creep life was most marked when the creep tests were interrupted just prior to the onset of the tertiary stage. The significance of the results is discussed in terms of possible recovery mechanisms.
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