Title:
STEEL MATERIAL FOR ULTRASONIC SHOCK TREATMENT HAVING EXCELLENT FATIGUE STRENGTH AND ULTRASONIC SHOCK TREATMENT METHOD
Document Type and Number:
Japanese Patent JP2007284777
Kind Code:
A
Abstract:
To provide a steel material for ultrasonic shock treatment having excellent fatigue strength, and to provide an ultrasonic shock treatment method.
Regarding the multi-layer steel material in which a soft layer 6 is formed on the surface 1, the thickness of the soft layer 6 is controlled to 0.1 to <1.0 mm, and also, the Vickers hardness Hvs of the soft layer 6 and the Vickers hardness Hvi of an internal layer 7 other than the soft layer 6 are allowed to satisfy equation. Then, the steel material for ultrasonic shock treatment is subjected to ultrasonic shock treatment using a leading edge tool 5 with a width R of 2.0 to 5.0 mm.
COPYRIGHT: (C)2008,JPO&INPIT
Inventors:
SETO KOJI
Application Number:
JP2006116927A
Publication Date:
November 01, 2007
Filing Date:
April 20, 2006
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C22C38/00; C21D7/04; C22C38/60
Attorney, Agent or Firm:
Nobuyuki Hayashi
Yasuhiko
Yasuhiko