PRODUCTION OF ULTRA-FINE CRYSTAL GRAIN METALLIC MATERIAL BY CONTINUOUSLY STIRRING AND SOLIDIFYING

摘要

PROBLEM TO BE SOLVED: To provide a producing method of an ultra-fine crystal grain metallic material, by which a mesoscopic structural control for improving the material characteristic by finely making the crystal grain fine size can be achieved in a simple means. SOLUTION: Molten metallic material heated and melted in a melting chamber is introduced from the melting chamber to a stirring chamber, and in this stirring chamber, after stirring for a short time with a screw-like stirring bar 15 rotation-driven at high speed, this metallic material is ejected from an ejecting nozzle 20 at the outlet side under solid-liquid coexisting condition. The metallic material under the solid-liquid coexisting condition ejected from the nozzle 20 is formed as a continuous plate-state while immediately and quickly cooling and solidifying with rolls 22 under condition of containing the minute crystal grains in this metallic material.