Abstract
Tremendous focus has been put on the control of particle size distribution which effects the grain structure and mechanical properties of resulting metallic materials, and thus nucleation and growth of particles in solution should be clarified. This study uses classical nucleation theory and Ostwald ripening theory to probe the relationship between the compositions of Fe-O-Al-Ca melts and the behavior of particles under the condition of no external stirring. Our experimental data suggest that decreasing the initial Ca addition and Al addition is conductive to the increase of nucleation rate for calcium aluminate particles, which exhibits a same change trend with that predicted from classical nucleation theory. Based on the experimental evidence for particles size distribution in three-dimensional, we demonstrate that Ostwald ripening is the predominate mechanism on the coarsening of particles in Fe-O-Al-Ca melt at early stage of deoxidation under the condition of no external stirring but not at later stage.
Highlights
Controlling on the characteristics of particles in the metallic materials has been one of the leading subjects in the field of metallurgy which directly effects the progress of melting[1], mechanical properties and service life of final products[2,3]
The experimental nucleation rates of calcium aluminates decrease in the order of experiments A1C1< A1C3< A2C3, exhibiting a same change trend with theoretical values, which indicates that decreasing the initial Ca addition and Al addition is conductive to the increase of nucleation rate for calcium aluminate
The nucleation rate of calcium aluminates is dependent on their type and the composition of melt
Summary
Controlling on the characteristics of particles in the metallic materials has been one of the leading subjects in the field of metallurgy which directly effects the progress of melting[1], mechanical properties and service life of final products[2,3]. Many scholars advocate that it is important to obtain the fine particles in sub-micrometer or nanometer scale whose number density is considerably large and volume fraction is small[18,19,20] From this point of view, it is critical to investigate the nucleation and growth behavior of particles in the metallic materials. Compared with Al2O3, the distribution curve of CaO- Al2O3 was narrower and nucleation rate was higher, indicating that CaO- Al2O3 particles were fine and in large amount in Fe-10mass%Ni alloy They advocated that the supersaturation degree, and interfacial energy between oxide particles and liquid Fe, and the equilibrium deoxidation constant affect the nucleation and growth of particles in early stage of deoxidation under no coagulation of deoxidation particles by collision. This study will provide information to predict the nucleation and growth of particles in the melt and will be helpful for controlling behavior of particle
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