High vacuum cast ingots

Details High vacuum cast ingots High vacuum cast ingots

1986-07-02

1987-09-01

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

428586, 428937, 148425, 148426, 148428, B22D 2506

Patent

active

046908757

ABSTRACT:
Method and apparatus for producing a fine-grain ingot are disclosed. A feedstock stick is melted to produce a series of fully molten drops or a stream, which falls on the upper surface of an ingot being formed, to cover a portion thereof which is substantially less than the ingot's total upper surface. The mold is moved laterally with respect to the feedstock stick at a rate which is high enough so that the molten metal impinges upon different portions of the ingot's upper surface but which is low enough to prevent a substantial centrifugally outward flow of the metal impinging on the upper surface of the ingot. The molten metal melt rate is so selected that the impact region on the ingot's upper surface is at or below the solidus temperature of the alloy and above a temperature at which metallurgical bonding with the successive impinging metal can occur. The resulting ingot is characterized by a uniform transverse grain size in the range of ASTM 3 to 9 and a uniform longitudinal grain size of of at least equal to the transverse dimension. The ingot is further characterized by a subgranular structure of substantially equiaxed cells having an average diameter of between about 20 .mu.m and about 80 .mu.m. The ingot is substantially 100% dense, has less than 5 ppm total oxygen content and less than one ppm oxygen as insoluble oxide.

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Unit Processes of Extractive Metallurgy; Chapter 8 Melting, Pouring, and Solidification, pp. 226-260.

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