鉄基二元合金のデンドライト・アーム・スペーシング

抄録

Few systematic studies were made to show the effects of solidification variables and alloying elements on the primary and secondary dendrite-arm spacing in ferrous alloys. This study is aimed to make clear the effects mentioned above in Fe-Ni, Fe-Si and Fe-P binary alloys. The results obtained are summarized as follows:
1) The primary arm spacing, d₁ is given by the following equation, where, m is the liquidus slope, C the content of alloying element, k the distribution coefficient, V the cooling rate and a₁ a constant.
2) The secondary arm spacing d₂ is given by the following equation after the coarsening theory proposed by Kattamis and Flemings, where, θ is the local solidification time and d_2-0 is a constant which depends on the diffusion coefficient of the alloying element in both liquid and solid and the solidification temperature.