Method for surface modification of titanium or titanium alloy

摘要

And aims to improve abrasion resistance of surfaces of titanium or titanium alloys such as leisure motorcycle parts.;An inert gas is supplied to the surface of the titanium or titanium alloy, the high energy density beam is irradiated, the irradiated portion is melted, and then an assist gas containing oxygen or oxygen is supplied in a semi-molten state. So as to form a gentle slope on the surface.;It is possible to obtain a material which does not cause pitching against severe sliding action by forming a hardened layer having a hardness and a sufficient thickness and having a hardness gradient from the outermost surface to the base in the titanium or titanium alloy material. This is useful as a bicycle parts, for example.