Abstract
1) The solubility of graphite in pure cobalt and nickel was determined at various temperatures. Temperature dependence of graphite solubility in nickel and cobalt was as follows:a) Nickel logNc=-875/T 0.521b) Cobalt logNc=-1050/T-0.265(2) The solubility of graphite in nickel-cobalt solutions was also determind at 1400°C. From these data, excess partial molar free energy was calculated to be about -300 cal/gram atom, and it showed that the solution of this alloy was not an ideal.(3) Effects of alloying elements such as Si, Mn, Cr, V and Mo on the solubility of graphite in liquid Ni and Co were investigated at 1400°C. The interaction parameter of Wagner εXC=-(∂ln NXC/∂NX) was calculated and found comparable with that of liquid iron.(4) With the systems Ni-Cr-Mn-C and Co-Cr-Mn-C the solubilities of graphite were determind at 1400°C. The experimental results were in good agreement with calculations from the ternary systems in dilute solution.
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