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National Advisory Committee for Aeronautics, Technical Notes - Survey of Portions of the Cobalt Chromium Iron Nickel Quaternary System

An isothermal survey was made of certain portions of the chromium—
cobalt—nickel—iron quaternary system at 12000 C. The iron content was
varied up to 30 percent to include the range of commercial chromium—
cobalt-nickel alloys. As a part of the quaternary system, the cobalt—
chromium-iron ternary system was also studied.

A project has been initiated at the Metallurgy Department of the
University of Notre Dame for the study of phase diagrams pertinent to
certain alloys commercially used for high—temperature service. In a
previous report (reference 1) on work done in connection with this proj—
ect, an isothermal survey of the ternary chromiumrcobalt-nickel system
was given for 12000 C.

In order to make the results of the investigation valuable for
practical applications, it was foreseen that the work would have to be
extended to cover more complex systems and, in certain critical composi-
tion ranges, also to include lower temperatures. The work covered by
the present report was carried out in accordance with this general plan.

Some of the most important alloy components occurring in commercial
alloys of chromium-cobalt—nickel base are iron, molybdenum, silicon,
and carbon. In order to proceed systematically and thoroughly in this
work, it was planned to explore at first the effects of the addition of
each of these elements separately. In the present work an isothermal
survey of the practically most important portion of the chromium—cobalt-
nickel—iron quaternary system at 12000 C was made. The iron content was
varied up to 30 percent to include the range of commercial alloys of
chromium-cobalt-nickel base. Since at 12000 C most of these alloys con-
sist largely of face-centered cubic solid solutions, it was considered
that the limits of solid solubility of this phase with varying iron
contents would be of the most immediate concern.