Material for plastic working and production method thereof

摘要

A material for plastic working is produced by the steps of using a mold having a mold cavity ( 16 ) partially defined by an end surface of a stopper ( 13 ) for closing a molten metal inlet ( 101 ), teeming molten metal ( 10 ) into the mold cavity through the inlet and cooling the molten metal to thereby attain unidirectional solidification of the molten metal. Regulation of the cooling rate enables the mean grain size to be graded in the direction from the cooled face (B surface) to the opposing face (T surface) and the added components to increase in the same direction. It is possible to obtain a material for plastic working that has a selected portion exhibiting an excellent function.