The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2002
Filed:
Jul. 07, 2000
Applicant:
Inventors:
Kouji Ohbayashi, Anjo, JP;
Michio Maruki, Anjo, JP;
Takao Taniguchi, Anjo, JP;
Yoshimi Watanabe, Anjo, JP;
Assignee:
Aisin AW Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 1/09 ;
U.S. Cl.
CPC ...
C21D 1/09 ;
Abstract
In a steel member surface treatment method, only a surface layer portion of the steel member is heated to its melting point or higher to form a melt, by high density energy-beam irradiation. Subsequently, the melted portion is rapidly cooled to a martensitic transformation region, to form a martensitic structure. The temperature increasing rate in irradiation of the surface layer of the steel member is preferably 7500° C./second or greater. Thereby, thermal strain and quenching failure are reduced even if the steel member is a thin plate component and a high production efficiency can be achieved.