Importance

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Abstract

To provide a method for surface treatment of a powdery metal material used for manufacture of harmonic structure metal in which a fine grain region and a coarse grain region are harmonically arranged. The method includes the steps of: using a blasting machine which ejects ejection powder with a compressed gas in a cabinet and causes the ejection powder to collide against an object to be collided and comprises dust collecting means; and performing blasting of causing a powdery metal material and a medium substance having hardness equal to or higher than that of the powdery metal material to collide with each other repeatedly, and exfoliate surface oxides from the powdery metal material and also form the fine grain region having a crystal grain diameter smaller than a crystal grain diameter of a center part in the vicinity of a surface of the powdery metal material.

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First Claim