Alloys or metallic compositions – Ferrous – Four percent or more aluminum containing
Patent
1985-09-19
1988-09-06
Andrews, Melvyn J.
Alloys or metallic compositions
Ferrous
Four percent or more aluminum containing
420 79, 420100, 420101, 420103, 420 99, 148334, 148333, 148320, C22C 3806
Patent
active
047692146
ABSTRACT:
An ultrahigh 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, aluminum in an amount of from about 0.5 to about 10 weight percent, an effective amount of a stabilizing element acting to stabilize iron carbide against graphitization, and the balance iron. Preferably, the aluminum is present in an amount of from about 0.5 to about 6.4 weight percent and the stabilizing element is chromium. The steel has excellent ductility and is readily hot, warm and cold worked without cracking. It is particularly useful in superplastic forming operations, and may be processed to a suitable microstructure by any technique which reduces its grain size to about 10 microns or less, and preferably to about 1 micron. Such a very fine grain size is readily acheived with the steel, and the aluminum and stabilizing additions act to retain the fine grain size during superplastic processing.
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patent: 4448613 (1984-05-01), Sherby et al.
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C. F. Jatczak, "Hardenability in High Carbon Steels", Oct. 1973 (Metallurgical Transactions, vol. 4, p. 2267).
Sherby and Wadsworth, "Damascus Steels", Feb 1985 (Scientific American, vol. 252, No. 2, p. 112).
Sherby et al., "Ultrahigh Carbon Steels" Jun. 1985 (Journal of Metals, vol. 37, No. 6, pp. 50-56).
Dong Wha Kum et al. "Superplastic Ultrahigh Carbon Steels" American Society for Metals reprint No. 8401-002 Mar. 1984.
Kum Dong W.
Oyama Toshimasa
Sherby Oleg D.
Wadsworth Jeffrey
Andrews Melvyn J.
Garmong Gregory O.
SPTek
Yee Deborah
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