Effects of Alloying Elements on Interdendritic Microsegregation of Carbon Steel

Synopsis : Effects of alloying elements on interdendritic microsegregation of carbon steels during solidification were analyzed by unidirectional solidification experiments and mathematical analysis. In the mathematical analysis, the diffusion of solutes in solid and redistribution of solutes at solid/liquid and at ƒÂ/ ƒÁ interfaces were taken into consideration. Based on the observed and calculated results, it was found that microsegregation decreased by addition of ferrite former elements, and on the other hand, it increased by addition of austenite former elements. It was clarified that the addition of ferrite former elements caused the increases of the extent of diffusion in solid and that of redistribution between ƒÂ and ƒÁ phases, which reduced microsegregation.