Ultra high carbon steel alloy and processing thereof

Details Ultra high carbon steel alloy and processing thereof Ultra high carbon steel alloy and processing thereof

1983-09-30

1985-08-06

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123L, 148 36, 148 12R, 148 12C, C21D 714

Patent

active

045333904

ABSTRACT:
An ultra high carbon steel having a composition of carbon in an amount of from about 0.8 weight percent up to the maximum solubility limit of carbon in austenite; silicon in an amount of from about 3 to about 7 weight percent; an effective amount of a stabilizing element acting to stabilize iron carbide against graphitization in the presence of silicon; and the balance iron. Preferably, the silicon is present in an amount of about 3 weight percent, and the stabilizing element is chromium. The ultra high carbon steel may be processed to a form suitable for subsequent superplastic forming by any technique which reduces its grain size to about 10 microns or less, and preferably to about 0.4 to about 2 microns. The silicon and the stabilizing element act to produce a stable iron carbide particle array to retain the fine grain size during superplastic processing, and to increase the eutectoid temperature so that superplastic processing may proceed at high strain rates and low stress levels at elevated temperature.

REFERENCES:
patent: 3762964 (1973-10-01), Kranenberg
patent: 3857741 (1931-12-01), Hultgren et al.
patent: 3951697 (1976-04-01), Sherby et al.
patent: 4043843 (1977-08-01), Tanczyn
patent: 4448613 (1984-05-01), Sherby et al.

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