1674. KASE, T. Equilibrium Diagram of the Iron-Carbon-Nickel System. Sci. Repts. Tôhoku Imp. Univ., vol. 14, 1925, pp. 173-217; Chem. Abs., vol. 20, 1926, p. 570.

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Literature Abstracts

Thermal and magnetic analyses, hardness tests, and microscopic examinations are reported for the Fe-Ni system, and the binary equilibrium diagram is concluded to be of the solid-solution type. The A₃ change falls steadily with increasing Ni content down to –190° at 35% Ni and occurs in a temperature interval rather than at a point. Ni dissolves C up to 0.55%, forming a eutectic with C at 1318° and 2.22% C. Ni₃C is very unstable and cannot be detected with the microscope. The ternary diagram was worked out and is described and illustrated by a sketch of a model. Photomicrographs of typical structures also are shown. For etching specimens with over 25% Ni either strong HNO₃ or hot Hcl was used. No ternary eutectic was found. A binary eutectic contains 4.3% C with no Ni and decreasing C down to 0.3% with increasing Ni up to 30%. Cementite occurs in the ternary alloys with 0 to about 30% Ni, with over 0.1% C. With increasing Ni, the A₁ transformation is lowered and is difficult to detect with over 10% Ni, but is almost independent of the C content. With increasing Ni, the A₂ and A₃ points are rapidly lowered, and the C content at the eutectoid point decreases down to 0.3% at about 35% Ni. 6 plates of curves accompany this paper.