δ/γ transformation in non-equilibrium solidified peritectic Fe-Ni alloy

Abstract

Through phase transformation kinetic analysis and experimental observation, the δ/γ transformation occurring in the non-equilibrium peritectic Fe-4.33at.%Ni alloys was systematically investigated. According to JMA solid-state transformation kinetic theory, the Time-Temperature-Transformation (TTT) curves of the δ/γ transformation in peritectic Fe-Ni alloy were calculated. On this basis, the physical correlation between the δ/γ transformation and the initial undercooling of melt (ΔT) was elucidated. The results indicate that the change of ΔT can alter not only the overall δ/γ transformation pathways but also the transformation fraction with respect to each transformation mechanism. © 2007 Science in China Press.