２次再結晶法によるＭｏ巨大双結晶板の製造

Abstract

In order to obtain a large-scale bicrystal in sheet molybdenum by means of secondary recrystallization, the effects of rolling reductions and procedures on the secondary grain growth behavior were investigated texturally and optically.It has been found that the development of secondary grain from both surfaces or a surface of sheet is strongly dependent on the rolling reductions. For the case of straight-rolled sheet having rolling reductions of 73%-93%, an abnormal grain growth from both surfaces occurred after an anneal at 1850°C and a large-scale bicrystal was obtained. In contrast, the abnormal grain growth from both surfaces occurred for the cross-rolled sheet having rolling reductions of 86%-93%.These behaviours can be explained in relation to the texture gradients, and the shape and size of grains in the thickness direction obtained for primary recrystallized sheets as results of rolling reductions and procedures.