High-temperature eutectoid alloy and process of making

Details High-temperature eutectoid alloy and process of making High-temperature eutectoid alloy and process of making

1974-03-21

1976-01-20

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75170, C22C 1902

Patent

active

039334813

ABSTRACT:
A continuous process for producing novel aligned composites of a Co-Si eutectoid type alloy having significant tensile strength is provided. The process comprises forming a melt of a Co.sub.3.sub.-x M.sub.x Si.sub.1.sub.-y N.sub.y alloy where M represents certain elements substituting for Co and x has a value ranging up to 0.6, where N represents certain elements substituting for Si and y has a value ranging up to 0.2, unidirectionally cooling said melt through a thermal gradient at a velocity which produces a solid having elongated columnar macro-grains aligned substantially parallel to each other, and unidirectionally cooling said macro-grain solid through said thermal gradient at said velocity which on reaching transformation temperature directionally transforms said solid into an aligned solid composite consisting essentially of at least two phases, the ratio of said thermal gradient to said velocity being greater than 150.degree.C/cm.sup.2 /hr. The phases are in the form of substantially uniform alternating lamellae parallel to each other and have an average interlamellar spacing less than 3 microns. The composite is substantially or completely free of dendrites.

REFERENCES:
patent: 3694193 (1972-09-01), Carpay et al.

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