Effect of heat treatment on the fine structure and properties of a niobium-base superalloy

Abstract

The effect of conditions of heat treatment on the microstructure and mechanical characteristics of an LN-1 alloy (Nb–10W–5Mo–1.5Zr–0.15C), which is used to produce high-temperature springs, has been studied. The temperature conditions of annealing of the alloy have been chosen, under which the fairly high ductility needed for the subsequent deformation of the alloy is achieved. Structural examinations have revealed the formation of fine niobium–zirconium carbides in the matrix in the course of the thermomechanical strengthening of the alloy, which involves preannealing.