超合金INCONEL Alloy 718の熱間加工工程における粒径の予測と制御

概要

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To predict and control micro-structural evolution of Ni-based INCONEL Alloy 718 in hot working process is essential. Retained coarse grains in products are very difficult to be refined by subsequent heat treatment. In many papers, break down of casting structure is mostly focused. This paper treats constitutive equations for recrystallized structure. In order to quantify the influences of working conditions on micro-structural events correctly, homogeneous compression tests with cylindrical specimen were performed. The flow curves with heat generation during working were temperature compensated and constitutive equations of recrystallization were also established. To verify the validity of given equations, open die forging with small ring billets were carried out. In the result, the tendency between observation and thermal mechanical FEM simulation was in good agreement.
電気製鋼研究会の論文