Abstract
The powder of nickel-base superalloy Mod. IN-100 has been consolidated by hot isostatic pressing and recrystallized by rolling up to 80% at 1 123 K and subsequent annealing at 1 423 K. The superplastic behaviour of alloy sheets prepared by above processing has been investigated in the temperature range of 1 223-1 423 K and over a range of strain rates from 2.5×10-4 to 2.5×10-2 s-1.
The Inσ vs. Inε curves were obtained and it was shown that the conditions obtaining the maximum strain-rate sensitivity index m changed from the constant strain rate at temperatures above 1 323 K to the constant flow stress below 1 323 K, so that the Inσ vs. Inε curves were possible to divide into six regions according to the deformation behaviour.
