| 摘要 |
PROBLEM TO BE SOLVED: To make realizable of a semi-solid casting with which fine crystal grain can be obtained in an alloy having extremely narrow temperature interval of a solid-liquid coexisting range, for example, < 50°C, such as 5052 aluminum alloy. SOLUTION: In the semi-solid casting method comprising a process, in which the solid-liquid coexisting state of slurry is obtained by making flow-down molten alloy onto an inclined cooling plate and separating while generatingαprimary crystal on this inclined cooling plate, and a process, in which theα-phase grains are granulated by holding this slurry to the temperature range in the solid-liquid coexisting range with a tundish having no temperature inclination; a parting material provided with a heat-insulating function is formed on the surface of the inclined cooling plate, and the film thickness of this parting material is adjusted to such relation as to become thicker according to making narrower of the temperature interval of the solid-liquid coexisting range, and for example, the film thickness of the parting material is made to at least≥105μm at the upstream side, pouring the molten metal onto the inclined cooling plate, and to 30μm at the downstream side therefrom. COPYRIGHT: (C)2007,JPO&INPIT
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