Bainitic Kinetics

Abstract

<p> The growth kinetics of a plates and rods in B-brass have been calculated using a local equilibrium model. These are in good agreement with published experimental data. Along with this, quantitative microanalysis of deep etched specimens ts cited in support of the proposed diffusional mechanism for their formation. </p> <p> The model was also employed to calculated the growth rates of upper bainitic rods in the Fe-C-Nisystem at 400° C. A "phase diagram" was constructed in order to supply the effective supersaturations required by the local equilibrium model$ Lengthening rates were also calculated using a paraequilibrtum Interface condition. The experimental data were correctly predicted assuming the former case but failed at the "phase" boundary. It seems that a solute drag might well operate in this system. These results have provided some further indication of the part alloying elements play in the formation of the microstructural constituents of steel. </p>