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Discontinuous precipitation in CoMo and CoMoC alloys

The influence of 0.3 wt.% of carbon on discontinuous precipitation (DP) in Co 14.8 wt.% Mo alloy has been investigated at temperatures 925 K and 1025 K. The changes of solute concentration in nanoareas of discontinuous precipitates have been measured by means of the analytical electron microscopy while the linear growth of DP was estimated using a method of quantitative metallography. The investigation has shown that DP is preceded by the formation of martensite, basket-like structure as well as a small amount of MoC carbides in the matrix. The fraction of martensite increases after carbon addition to the binary alloys while the growth rate decreases. It has also been revealed that the height of Mo-profile within the α lamellae (and α-parameter) increases in the CoMoC alloy. Based on the Mo concentration profiles within the α lamellae, the α-parameter in C a h n 's diffusion equation and the diffusivity at the moving boundary have been determined. The diffusivity decreased after addition of small amount of carbon to the binary alloy. Such an effect is explained from one side as a decrease of boundary steps due to blocking by carbon atoms. Simultaneously the mobility of precipitation front decreases as a result of presence of martensitic structure in the matrix.