Method and apparatus for casting ingot with refined grain struct

Details Method and apparatus for casting ingot with refined grain struct Method and apparatus for casting ingot with refined grain struct

Filed on

1984-12-17

Date issued

1986-03-25

Examiner

Lin, Kuang Y.

Patent Class

Metal founding

SubClass

Process

SubSubClass

Shaping liquid metal against a forming surface

Other Related Categories

164485, 164443, 164459, 164418, B22D 11124, B22D 2702

Type

Patent

Status

active

Patent number

045776768

Description

ABSTRACT:
A method and apparatus for casting an ingot with refined grain structure from a metallic melt supplied to a casting mold. The mold is intermittently cooled to form a zone of fine dendrites on the inner peripheral surface of the mold. Then, the fine dendrites are reheated to detach secondary dendritic arms therefrom. Finally, the detached secondary dendrite arms are mixed into the melt to serve as nuclei for grain refinement as the melt solidifies into a cast ingot having a refined grain structure.

REFERENCES:
patent: 2419373 (1947-04-01), Schrumn
patent: 3153820 (1964-10-01), Criner
patent: 3441079 (1969-04-01), Bryson
patent: 3502133 (1970-03-01), Carson
patent: 4388962 (1983-06-01), Yarwood et al.
patent: 4434839 (1984-03-01), Vogel
patent: 4450893 (1984-05-01), Winter et al.
patent: 4482012 (1984-11-01), Young et al.
"Influence of Coarsening on Dendrite Arm Spacing of Aluminum-Copper Alloys", by Kattamis et al., Transactions of the Metallurgical Society of AIME, vol. 239, Oct. 1967, pp. 1504-1511.
"On the Origin of the Equiaxed Zone in Castings" by Jackson et al., Transactions of the Metallurgical Society of AIME, vol. 236, Feb. 1966, pp. 149-157.
"Direct Chill Casting Process for Aluminum Ingots-A New Cooling Technique", by N. B. Bryson, Canadian Metallurgical Quarterly, vol. 7, No. 1, pp. 55-59.

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