Sub-zero temperature plastic working process for metal

Details Sub-zero temperature plastic working process for metal Sub-zero temperature plastic working process for metal

1976-04-21

1978-04-11

Combs, E. M.

Metal deforming

Process

With temperature maintenance or modification

72700, 148 115F, 148125, B21D 3100

Patent

active

040832201

ABSTRACT:
Improvements in a plastic working process for face-centered cubic metals, and titanium and zirconium having close-packed-hexagonal lattice, which process utilizes a phenomenon that the ductility of these metals is increased at sub-zero temperatures, i.e., temperatures below 0.degree. C. This process includes the steps of (i) imparting plastic flow including at least a uniaxial tensile stress field a metal at a temperature below zero, (ii) subjecting the metal to plastic flow to an extent that the strain of the metal is within the limit of uniform elongation of the metal, and then to plastic flow including at least a uniaxial tensile stress field continuously thereafter, or (iii) using frost as a lubricant for plastic working at temperatures below 0.degree. C according to either one of the foregoing steps.

REFERENCES:
patent: 2165056 (1939-07-01), Kalischer
patent: 3337372 (1967-08-01), Reed-Hill
patent: 3568491 (1971-03-01), Bruner et al.
patent: 3653250 (1972-04-01), Collins
patent: 3661655 (1972-05-01), Hrusovsky
"Ice as a Lubricant", Metalworking Production, p. 9, Feb. 8, 1961.

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