High strength formed article comprising hyperfine grain...

Details High strength formed article comprising hyperfine grain... High strength formed article comprising hyperfine grain...

2006-02-28

2011-12-06

King, Roy (Department: 1733)

Metal treatment

Stock

Ferrous

C148S598000, C148S599000, C148S595000, C411S424000, C411S403000

Reexamination Certificate

active

08070888

ABSTRACT:
A wire rod or a steel wire of a bamboo nano-structure, whose mean grain diameter in a C-direction section is 200 nm or smaller, is prepared by applying a hot or warm working and additionally applying a cold working to a steel and next, by performing a forging, by a tool or a die such as cold pressure production, to a section, of a desired, limited site, other than a section parallel to an L-direction, an equiaxed nano-structure, whose mean grain diameter is 200 nm or smaller, is formed in this site. As a typical example of a formed article, there is enumerated a high strength micro screw in which a shaft outer diameter is 1.6 mm or smaller, a surface layer part of a head part recess has equiaxed nano-structure and a hardness Hv≧300, and a screw main body portion has bamboo nano-structure and a hardness Hv≧250.

REFERENCES:
patent: 4466842 (1984-08-01), Yada et al.
patent: 4874644 (1989-10-01), Fergison
patent: 2004/0112484 (2004-06-01), Saito et al.
patent: 1 559 804 (2005-08-01), None
patent: 1580291 (2005-09-01), None
patent: 2004-060046 (2004-02-01), None
patent: 2005-194550 (2005-07-01), None
patent: 2005-320630 (2005-11-01), None
Machine translation of JP2004-060046 (Japanese document published Feb. 26, 2004).
Toshiyuki Watanabe, “Kikai-yo Kouzou-yo Kou”, Nihon Tekko Kyoukai, pp. 46 and 97.

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