The systems Ni-Ti-C, Ni-V-C, Ni-Zr-C, Ni-Nb-C, Ni-Mo-C, Ni-Ta-C, and Ni-W-C were studied by means of gas carburization and electron probe microanalysis in the nickel-rich portion. The solubility of carbon and each carbide-forming element in nickel at 1100°C were determined as follows : ([A] is the atomic percent of A.)
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The hardness of the carburized alloy was measured by a micro-hardness tester. The result showed that the increase in hardness was negligibly small with the carburization. It was thought that the hardening of the matrix itself is necessary for the hardness of the carburized layer under such a condition of carbide-dispersion as in the present work.