Ferritic Decomposition in Fe–36Ni–3Cr Invar Alloy

Nickel redistribution and austenite decomposition into ferrite with the formation of up to 15% α‑ferrite crystals 10–100 nm in size in a fairly stable Fe–36Ni–3Cr invar alloy were found. The austenite decomposition during heating in a 250–400°C temperature range is intensified by preliminary strong plastic deformation by rolling or shearing under high pressure.