Title:
Surface treatment method for metal products and metal products
Document Type and Number:
Japanese Patent JP6307109
Kind Code:
B2
Abstract:
Provided is a surface treatment method capable of continuously forming a uniform nanocrystalline structure along the surface of a metal product regardless of whether the metal product is hard or soft. In the present invention, a substantially spherical spray powder having a median diameter of 1-20 µm and a fall velocity in the air of 10 sec/m or more is sprayed onto a metal product at a spray pressure of 0.05-0.5 MPa. Thus even when the metal product is made of a soft material in a range from the surface of the metal product to a predetermined depth along the surface, it is possible to form a uniform continuous nanocrystalline structure layer in which nanocrystals are micronized to an average crystal grain size of not more than 300 nm, preferably not more than 100 nm, without forming a laminar worked structure, impart a high compression residual stress of from about -180 MPa up to the order of -1200 MPa, and strengthen the surface of the metal product.
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Inventors:
Keiji Mase
Shozo Ishibashi
Yusuke Kondo
Shozo Ishibashi
Yusuke Kondo
Application Number:
JP2016101655A
Publication Date:
April 04, 2018
Filing Date:
May 20, 2016
Export Citation:
Assignee:
Fuji Manufacturing Co., Ltd.
International Classes:
C22F1/04; B24C1/10; C21D7/06
Domestic Patent References:
| JP3879059B2 | ||||
| JP5341971B2 | ||||
| JP200991606A | ||||
| JP3150048U |
Attorney, Agent or Firm:
Kokura Patent Office