Rheological properties of EP962NP nickel powdered superalloy under deformation in the two-phase region with industrial stamping rates and structural changes corresponding to deformation

Abstract

The results of thermal deformation tests of EP962NP nickel powdered superalloy at deformation temperatures of 1100, 1150, and 1200°C and deformation rates of 0.1 and 1 s^–1 using a Gleeble System 3800 complex of physical simulation of thermomechanical processes are presented. The data on the variations in sample microstructure during deformation are presented. Conditions of the formation of ultra-fine-grain structure in the alloy, which is necessary to implement the superplasticity mechanism, are established. Based on the rheological characteristics, recommended modes of thermal deformation treatment of wares made of EP962NP alloy, which surpasses the most widespread domestic powdered nickel alloys by a complex of strength properties and heat resistance, are determined. It is of interest to fabricate the wares of this alloy according to the HIP + deformation technology: the implementation of this approach will make it possible in increasingly improve the characteristics of this alloy.