High-strength forged parts having high reduction of area and...

Metal treatment – Stock – Ferrous

Reexamination Certificate

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C148S649000, C148S333000, C148S334000, C148S335000, C148S336000, C148S654000

Reexamination Certificate

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10785080

ABSTRACT:
A high-strength forged part is disclosed which comprises a base phase structure, comprising 30% or more of ferrite in terms of a space factor, and a second phase structure, comprising bainite and/or martensite, and retained austenite having an average grain diameter of 5 μm or less and a content represented by 50×[C]<[VγR]<150×[C], wherein [VγR] represents a space factor of the retained austenite (γR) and [C] represents the mass % of C in the forged part. Furthermore, a high-strength forged part is disclosed which comprises a base phase structure, comprising 50% or more of tempered bainite or tempered martensite in terms of a space factor, and a second phase structure, comprising martensite and 3% to 30% retained austenite in terms of a space factor, wherein the portion of the retained austenite and martensite having an aspect ratio of 2 or less is 25% or less in terms of a space factor.

REFERENCES:
patent: 5505796 (1996-04-01), Kawano et al.
patent: 6306527 (2001-10-01), Ikeda et al.
patent: 6316127 (2001-11-01), Ikeda et al.
patent: 6319338 (2001-11-01), Kawano et al.
patent: 6544354 (2003-04-01), Kawano et al.
patent: 2004/0226635 (2004-11-01), Ikeda et al.
patent: 1 365 037 (2003-11-01), None
patent: 2001-220641 (2001-08-01), None
patent: 2001-220648 (2001-08-01), None
patent: 2004-285430 (2004-10-01), None
Unedited computer-generated English translation of Japanese patent 2001-220641, Seto, Kazhiro et al, Aug. 14, 2001.
U.S. Appl. No. 11/290,640, filed Dec. 1, 2005, Ikeda, et al.
U.S. Appl. No. 11/110,716, filed Apr. 21, 2005, Ikeda, et al.
U.S. Appl. No. 11/044,185, filed Jan. 28, 2005, Ikeda, et al.
U.S. Appl. No. 11/030,100, filed Jan. 7, 2005, Akamizu, et al.

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