Thermal mechanical treatment for enhancing high temperature...

Details Thermal mechanical treatment for enhancing high temperature... Thermal mechanical treatment for enhancing high temperature...

C - Chemistry, Metallurgy

21

D

148/31

C21D 8/00 (2006.01)

Patent

CA 1196555

-12- ABSTRACT OF THE DISCLOSURE Disclosed is a thermal mechanical treatment for improving the high temperature properties of cast austenitic heat resistant chromium-containing alloy steel structures which method comprises (a) heating the structures to at least the temperature at which chromium carbides go into solution, but below the temperature where incipient melting occurs; (b) maintaining the structures at such a temperature long enough so that at least 50% of the chromium carbides go into solution; (c) applying from about 15% to 60% plastic deformation by hot forming operations; and (d) cooling the structures to room temperature at such a rate to allow complete recrystallization of the grains to occur.

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