Method for casting metallic material while toughening the cast p

Details Method for casting metallic material while toughening the cast p Method for casting metallic material while toughening the cast p

1975-04-24

1976-08-31

Stallard, W.

Metal treatment

Compositions

Heat treating

148131, C21D 500

Patent

active

039779114

ABSTRACT:
An improved method for casting metallic material while toughening the cast piece is described herein. Essentially, the improved method utilizes a part of the thermal energy used for casting to toughen the cast piece by making use of super-plastic phenomena. After metallic material poured into a mould has been solidified, the mould is disintegrated during the period when the temperature of said metallic material is at a raised temperature higher than the temperature of 100.degree.C under a phase transformationpoint. Under the condition where the thus obtained intermediate product is loaded with a low stress of the order of 1/10 - 1/20 of the yielding point stress of said metallic material, super-plastic phenomena are generated by applying temperature cycles passing over said phase transformation point, and thereby said intermediate product is subjected to toughening treatment.

REFERENCES:
patent: 2875109 (1959-02-01), Carter et al.
patent: 3532561 (1970-10-01), Barto et al.
patent: 3895968 (1975-07-01), McCulloch et al.

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