Effect of Phase Distribution on Mechanical Properties of Fe—Ni Heterogeneous Alloys

Abstract

Fe–Ni heterogeneous alloys were prepared from powders by pressing, sintering, hot rolling, cold rolling, and heat treatment. A composite alloy was produced which consisted of ferrite, martensite, and austenite phases elongated parallel to the rolling direction. The volume fraction of each phase depended on the amount of Ni powder and the annealing temperature. The strength and elongation of the alloy increased with the amount of martensite phase and austenite phase, respectively. Both its yield strength and uniform elongation satisfied a rule of mixtures qualitatively. It was found that inhomogeneous Ni distribution affected the formation of each phase and the mechanical properties of the alloys.