炭素鋼のデンドライト間ミクロ偏析に対する合金元素の影響

抄録

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 δ/γ 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 δ and γ phases, which reduced microsegregation.