2009 年 35 巻 6 号 p. 314-317
The Ni-base self-fusing alloy layers are employed in a variety of wear resistance applications. The diode laser is more compact and the electro-optical-efficiency is higher about one order of magnitude. This is an advantage in both the small-size manufacturing field and large-size construction out door field. Another advantage is the wavelength. Due to shorter wave length most of the metals absorb diode laser (808nm) radiation more efficiently compared with CO2 laser (10600nm) enabling together with high power the use of wide beam optics. In this paper, five types of laser cladding conditions (laser power, scan speed, overlap rate, powder injection position and laser irradiation position) are examined and the structures and mechanical properties of the layers produced by each cladding condition are discussed. The Vickers hardness of laser cladding Ni-base S. F. alloy layer was increased from HV740 to 845 with increase in the layer power from 150W to 250W. Some recommended laser cladding processing conditions for a Ni-base S. F. alloy powder were scan speed of 6mm/sec, overlap rate of 60%, powder feeder nozzle angle of 60° and laser power of 200W.
