Method for improving fatigue properties in castings

Details Method for improving fatigue properties in castings Method for improving fatigue properties in castings

1977-10-07

1979-10-23

Husar, Francis S.

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

164113, 295262, 295271, B22D 11126

Patent

active

041715624

ABSTRACT:
A method for producing cast, superalloy, ferrous and titanium articles comprising the formation of a material void in the cast article, for example by utilizing a core during the casting operation or by machining a void after casting. The void is sealed relative to the surrounding atmosphere and the article is then subjected to an elevated temperature and pressure treatment in a gaseous atmosphere whereby the metal in the area of the void will yield so that the void is partially or totally eliminated. The pressure application is carried out at a temperature such that local deformation of the cast structure occurs in the region previously occupied by, and adjacent to, the void whereby a fine-grained recrystallized structure is developed in this section. Grain refined cast articles are characterized by superior low-cycle fatigue and tensile properties.

REFERENCES:
patent: 3758347 (1973-09-01), Stalker
patent: 4021910 (1977-05-01), Freeman, Jr. et al.

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