Method for improving low temperature ductility of directionally

Details Method for improving low temperature ductility of directionally Method for improving low temperature ductility of directionally

1991-07-26

1992-11-03

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148621, 148404, C21D 800

Patent

active

051605570

ABSTRACT:
A method of improving the low temperature ductility of an iron-aluminide is taught. The aluminide for which the method is applicable is one having between 30 and 50 atom percent of aluminum. The aluminide may also have substituents for part of the iron and for the aluminum. The alloy may contain up to 10 atom percent of substituents for the iron selected from the group of metals comprising nickel cobalt chromium and manganese. The alloy may also contain substituents for the aluminum of up to 5 atom percent of a metal selected from the group comprising titanium, niobium, tantalum, hafnium, zirconium, vanadium, and silicon. The alloy has a B2 crystal structure. The first step of the process is to select the metal to be processed. The next step is to directionally solidify the selected metal. The next step is to determine the Ductile Brittle Transition Temperature (DBTT). The metal is then heated to above the DBTT and is deformed while above the DBTT temperature. As a result of this treatment the ductility of the alloy is greatly improved.

REFERENCES:
patent: 4021271 (1977-05-01), Roberts
patent: 4613480 (1986-09-01), Chang et al.
patent: 4961903 (1990-10-01), McKamey et al.
patent: 4988488 (1991-01-01), Kang
patent: 5084109 (1992-01-01), Sikka

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