Mold with starter and selector sections for directional solidifi

Details Mold with starter and selector sections for directional solidifi Mold with starter and selector sections for directional solidifi

1984-07-23

1985-10-22

Godici, Nicholas P.

Metal founding

Means to shape metallic material

United particle type shaping surface

1641222, B22C 902

Patent

active

045482551

ABSTRACT:
Directional solidification of a single crystal superalloy article may be accomplished using a mold with a starter section, and a selector section to convert columnar growth from the starter into single crystal growth. In such a process, the deviation of [001] crystallographic orientation with respect to the longitudinal axis of the article being formed is reduced from 9 degrees to 5 degrees by controlling the heat transfer in the starter section. A stepped starter section, wherein the lower subsection has a volume of 52-98% of the total starter volume, and wherein the upper subsection is relatively small in lateral dimension, has been found most useful. When the solidification interface moves into the smaller width upper subsection, it becomes more nearly planar, and results in improved columnar growth in the starter, and in reduction in the crystallographic deviation of the article.

REFERENCES:
patent: 34021 (1881-08-01), Vishnevsky et al.
patent: 1793672 (1931-02-01), Bridgman
patent: 3494709 (1970-02-01), Piearcey
patent: 3536121 (1970-10-01), Piearcey
patent: 3568757 (1971-03-01), Piearcey
patent: 3572419 (1971-03-01), Barrow et al.
patent: 3580324 (1971-05-01), Copley
patent: 3763926 (1973-10-01), Tschinkel et al.
patent: 4111252 (1978-09-01), Day et al.
patent: 4133368 (1979-01-01), Hayes

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