Abstract
The alloys of iron, chromium and copper containing less than 40%Cr and 40%Cu were investigated by means of the thermal analysis, dilatation measurement and microscopic examination, and an equilibrium diagram of the ternary system is herein proposed.
In this system there exists no intermetallic compound and a nonvariant reaction, liquid +γ α+C, takes place at 1, 085°C. The domain of γ-phase in Fe·Cr·System is enlarged by addition of cop er, so that the alloy containing 14%Cr and 5%Cu consists of homogeneous γ-phase at high temperature, and the specimen with 19%Cr and 4%Cu, α- and γ-phases. As the chromium content increases, the solubility of copper in γ-iron and the copper content at eutectoid composition decrease at first and then increase, whilst the eutectoid temperature rises gradually and afterwards rapidly.
