Abstract
By means of microscopic observation as well as thermal, X-ray and magnetic analyses, ' the constitution of the Ni-Cr-C system was investigated, and its equilibrium diagram was determined, as shown in Fig. 4.
In this system, there exist 7 phases, each of which is found in binary systems, that is, γ(Ni), α(Cr), G(graphite), ε(Cr4C), η(Cr7C3), ζ(Cr3C2) and κ(CrC), and no ternary compound was in existence. The following 5 non-variant reac-tions, occur in this system the last one being inferred merely through the micro-examination:-
1) Melt (M1)_??_α+γ+ε (1305°) 2) Melt (M2)+η+ε (1315°) 3) Melt (M3)+η_??_γ+ζ (1260°) 4) Melt (M4)_??_γ+G+ζ (1240°) 5) Melt (M5)+κ_??_G+ζ (?)
