Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1978-10-25
1980-02-26
Baldwin, Robert D.
Metal founding
Process
Shaping liquid metal against a forming surface
164125, B22D 2704, B22D 2500
Patent
active
041900944
ABSTRACT:
An improved method of directional solidification is provided by varying the rate of withdrawal of a casting from the hot zone of a solidification furnace according to the sense of change of the perimeter to area ratio of the casting. The rates are varied to achieve desired microstructure and resultant properties in the casting. Also, the rate of withdrawal is varied according to controlled and predetermined relationships to cause the solidification interface to move through a transition section connecting sections of differing perimeter to area ratios in a manner which produces a desired microstructure in a first, transition, and second sections.
REFERENCES:
patent: 3124452 (1964-03-01), Kraft
patent: 3677835 (1972-07-01), Tien et al.
patent: 3700023 (1972-10-01), Giamei et al.
patent: 3763926 (1973-10-01), Tschinkel et al.
patent: 3790303 (1974-02-01), Endress
patent: 3897815 (1975-08-01), Smashey
patent: 3915761 (1975-10-01), Tschinkel et al.
"Computer Application in Directional Solidification Process" by Giamei et al, 3rd International Symposium on Superalloys-AIME, Seven Springs, Pa., 9/76.
"Growth of Composites from the Melt-Part II" by Mollard, et al., Trans. of AIME, vol. 239, 10/67, p. 1534.
Baldwin Robert D.
Lin K. Y.
Nessler Charles G.
United Technologies Corporation
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