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Synopsis: Effects of processing factors on the tensile properties and creep properties at 760 •Ž were investigated for "pan cakes" (thick circular disks) of a nickel-base superalloy prepared by procedures comprising a powdermaking by using HIP-processing a liquid-helium-cooled rotating disk technique, with or without Attritor treatment, and a super-plastic-forging developed specifically for this research. Major points of the obtained results were: (1) The HIP-processed material prepared from under-60-Tyler-mesh powder could be forged in a superplastic way only in a deformation rate of 0.2-0.5 •~ 10-4/s, while that from under-150-Tyler-mesh could in a rate of 1 •~ 1 0-4/s. The product from the cruder powder had a little superior tensile performance to that from the finer powder. (2) The product obtained by a superplastic-forging at lower temperature and higher deformation rate was apparently softer than that at higher temperature and lower deformation rate. The former had a larger elongation by tensile test and a shorter rupture life by creep test. (3) An Attritor pretreatment preceding HIP-treatment facilitated the superplastic-forging but it deteriorated the creep and tensile property drastically.

Effect of Processing Factors on Mechanical Properties of "Pancake" Prepared by HIP and Superplastic Forging from Nickel-Base Alloy Powder