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:
Aug. 21, 2018
Filed:
Mar. 11, 2015
Applicant:
Honda Motor Co., Ltd., Tokyo, JP;
Inventor:
Kenji Matsumoto, Wako, JP;
Assignee:
HONDA MOTOR CO., LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C 30/00 (2006.01); C21D 9/32 (2006.01); C21D 7/06 (2006.01); C23C 8/32 (2006.01); C21D 1/06 (2006.01); C21D 1/78 (2006.01); C23C 8/80 (2006.01);
U.S. Cl.
CPC ...
C21D 9/32 (2013.01); C21D 1/06 (2013.01); C21D 1/785 (2013.01); C21D 7/06 (2013.01); C23C 8/32 (2013.01); C23C 8/80 (2013.01);
Abstract
A surface of a steel material cut to a desired shape and carbonitrided is heated by excitation and thereafter repeatedly heated/cooled a predetermined number of times, such that an ultrafine crystal layer is formed immediately under the surface of the steel material and at least a predetermined number of cracks are formed under the formed ultrafine crystal layer, thereby enabling to increase toughness of the surface or immediately thereunder and enhance tenacity and inhibiting growth of cracks.