Casting a metal single crystal article using a seed crystal and

Details Casting a metal single crystal article using a seed crystal and Casting a metal single crystal article using a seed crystal and

1982-01-27

1984-10-09

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

164361, B22C 904, B22D 2500

Patent

active

044755821

ABSTRACT:
A method of epitaxially casting single crystal metal articles in molds, which comprises causing the solidification interface velocity vector to rotate through at least 90 degrees, preferably 180-540 degrees, about the axis of overall directional solidification growth. In addition, a mold section has a small passageway configured to prevent line of sight communication between the portion where the seed is contained and the article portion of the mold. Preferably, the passageway is shaped like a helix of 0.8-1.5 turns. A second seed can be formed in the mold of an article made from a first seed, and used to make a second casting. The invention reduces the normal increase in crystallographic variability which would otherwise be associated with such practice.

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