Metal treatment – Compositions – Heat treating
Patent
1985-08-16
1987-04-07
Morgenstern, Norman
Metal treatment
Compositions
Heat treating
148 627, 148 14, 427329, 4273744, 427431, 4273981, C23C 2270
Patent
active
046558527
ABSTRACT:
A steel article which is made of carbon or low alloy steel, with a prescribed chemical composition, is heat treated so that its yield strength is increased to a minimum of 60,000 psi and is subsequently dipped or spray covered with aluminum and then heated to interdiffuse aluminum metal and the iron in the steel matrix, thereby forming a new intermetallic layer which is an integral part of the steel article and which is essentially an aluminum-iron alloy, all in a manner which does not lower the yield strength of the steel below 60,000 psi. In the preferred form of the invention, a steel article is austenitized above its critical temperature for about 15 minutes or more and is subsequently rapidly cooled to below 600.degree. F. to transform the austenite structure to a much stronger martensitic structure and is then reheated to below 1341.degree. F. to temper the martensite. Aluminum is applied to the outer surface of the cleaned article by dipping in molten aluminum or otherwise, and the article is again reheated to above 1000.degree. F. but below 1341.degree. F. whereupon a substantial quantity of aluminum interdiffuses with the iron in the steel matrix, thereby forming a new intermetallic alloy layer. The interdiffusion process is carried out without reducing the yield strength level below 60,000 psi. This method provides an inexpensive, high-strength steel tool with enhanced corrosion resistance.
REFERENCES:
patent: 2544671 (1951-03-01), Grange et al.
patent: 2570906 (1951-10-01), Alferieff
patent: 2797476 (1957-07-01), Sendzimir
patent: 4056366 (1977-11-01), Lee et al.
patent: 4070210 (1978-01-01), Gierek et al.
Bell Janyce A.
Cantrell Thomas L.
Morgenstern Norman
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