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Title:
SURFACE TREATMENT OF HIGH SPEED STEEL
Document Type and Number:
Japanese Patent JPS5983718
Kind Code:
A
Abstract:

PURPOSE: To enhance the cutting property of high speed steel without deteriorating the toughness thereof, by a method wherein the surface of high speed steel subjected to hardening treatment is irradiated with laser light to dissolve the primary carbide in the surface layer in a matrix to form a solid solution and the irradiated high speed steel is further tempered to finely precipitate the primary carbide.

CONSTITUTION: After high speed steel is once subjected to hardening treatment, the surface thereof is irradiated with laser light of absorption energy density of 2,000J/cm2 or more at a beam moving speed of 2m/min or more to be melted. Hard primary carbides of Mo, W, V or the like in the surface of the high speed steel are dissolved in a matrix to form a solid solution with a uniform crystal structure. The treated high speed steel is subjected to tempering treatment at 500W600°C to precipitate the primary carbides in the solid solution in a fine form and a secondary hardening amount is increased to enhance anti-wear property, that is, cutting property without lowering toughness.


Inventors:
ASHIDA YOSHIO
SEKI YUUICHI
Application Number:
JP19510582A
Publication Date:
May 15, 1984
Filing Date:
November 05, 1982
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C21D6/00; C21D1/09; C22C47/08; (IPC1-7): C21D6/00
Domestic Patent References:
JPS5562119A1980-05-10
JPS50812A1975-01-07