69Ni-15Cr-8Fe-6Nb 基合金におけるセル状δ相の成長

概要

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The growth behavior of cellular δ phase in Ni-base alloy, modified Inconel X-750 type alloy (X-750M), was investigated mainly by optical and transmission electron microscopy. The values of n in Johnson-Mehl's equation for the growth of the cellular δ phase in X-750M aged in various conditions after a solution heat treatment were estimated to be 1.69-1.84. The values of n in the case of pre-aged X-750M at 943K for 253ks after a solution heat treatment followed by aging in various conditions, were estimated to be 1.44-1.67. The obtained value of n suggested that the growth of the cellular δ phase in X-750M after the pre-aging treatment obeyed a volume diffusion rate control with zero nucleation rate. Transformation curves of γ+γ" phases to the cellular δ+γ phases in the specimens aged after the pre-aging treatment were consistent with a theoretical one. The apparent activation energy for the growth of the cellular δ phase in X-750M aged after the pre-aging treatment was estimated to be 232kJ/mol, which is nearly equal to those for diffusion of solute atoms in the alloy.
社団法人日本鉄鋼協会の論文
1993-10-01