Nickel- (Ni) based alloy has been used in many industries, such as automobile industry, aerospace industry and nuclear power plant because of having high tensile strength in high temperature, creep strength and corrosion resistance. Especially, the gas turbine for next generation requires more complex shape to improve the performance. A laser powder bed fusion (L-PBF), one of the additive manufacturing technologies, is useful for direct and complicated shape formation for Ni based alloy. The L-PBF forms 3D material by building it layer by layer from a metal powder. In L-PBF, the powder absorbs the laser energy to heat to melt the metal powder and then solidify to form a layer. Generally, near infrared (N-IR) laser with a wavelength of around 1 um was employed in L-PBF process. In the blue region, the light absorption rate for many metals including Ni-based alloy are increased. Recently, a high-power and high brightness blue diode laser was developed in our laboratory. And the new L-PBF system installed with blue diode laser was developed. In our previous study, it was reported that 3D objects of the pure copper could be fabricated using this system.


In this study, the Ni based alloy was fabricated with the blued laser induced L-PBF system, and it was clarified the correlation between the laser wavelength and fabrication efficiency.