抄録
The effect of cooling rate and carbon content on the formation of nonequilibrium phases has been investigated in rapidly solidified 10Cr–5Mo and 10Cr–10Mo iron alloys containing very high carbon contents of 2 to 5% in mass. The cooling rate was varied by changing the nozzle size in a single roller method to result in an approximate value of 6·104 to 4·105 K/s. Nonequilibrium solid solutions of crystalline γ, ε and ψ phases as well as an amorphous phase were formed depending on the cooling rate and chemical composition of alloys. The optimum condition for obtaining the ε phase in the 10Cr–5Mo alloy and the ψ phase in the 10Cr–10Mo alloy was determined by the combination of cooling rate and carbon content. The higher carbon content and the higher cooling rate tend to bring about the amorphous formation. The amounts of carbon in solution in the γ, ε and ψ phases increased with increasing cooling rate and carbon content.
