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Synopsis Effects of boron and carbon contents on tensile properties at 760•Ž were investigated for Ni-base PM-alloys with compositions fixed for main components ( content of gamma prime phase : 65% ) . The obtained results were compared with those of cast alloys with the same composition of main component . When specimens were prepared by powder-metallurgical procedures•\HIP-consolidation of alloy powder , superplastic forging of it, or additional heat treatment on either of the former two•\,Yield Strength ( YS) , Ultimate Tensile Strength ( UTS) and Elongation to fracture (EL) were improved by addition of a small amount of boron (say 0.02%) except for the case of as-forged products. However, EL deteriorated by further increase in boron content, although UTS and YS remained almost unchanged. YS, UTS and elonga tion deteriorated, when carbon content increased from 0.02% to 0.20%. The properties of the HIPed or forged products were improved by an appropriate heat treatment. When specimens were prepared by casting, trend seen for as-cast products was not much different from what was seen for as-HIPed ones. After the same heat treatment, however, the properties abruptly deteriorated. EL vanished and UTS decreased by more than 30%.

Effects of Carbon and Boron Contents on High Temperature Tensile Properties of P/M Ni-base Superalloys