Ni 基合金粉末を HIP・超塑性鍛造した素形材の機械的特性に及ぼす加工条件の影響

概要

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Effects of processing factors on the tensile properties and creep properties at 760℃ were investigated for "pancakes" (thick circular disks) of a nickel-base superalloy prepared by procedures comprising a powder-making by using HIP-processing a liquid-helium-cooled rotating disk technique, with or without Attritor treatment, and a superplastic-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 1×10^<-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.
1986-09-01