微量液体を塗布した金属表面への短パルスレーザ照射効果

抄録

Surface modifications of titanium alloy (Ti-6Al-4V) and S45C coated with water or oil consisting of hydrocarbons and irradiated by a short pulse laser were investigated. The laser oscillator is a microchip laser that is small in size and has low power but high-power density. Surface analysis showed that a layer of carbides and oxides was formed on the surface of the metal by applying a small amount of liquid to the metal and irradiating it with a short pulse laser. Furthermore, the hardness in the laser-irradiated area was higher than that before laser irradiation. The reason for this is thought to be due to the effects of carbides and oxide layers, strain hardening and heat treatment due to temperature changes during laser irradiation, and peening effects. Thus, it is possible to perform localized and high value-added modification of surfaces easily and inexpensively using a compact laser device and readily available liquids.