Recently, Additive Manufacturing (AM) technology has been attracting interest because of its process to fabricate directly from CAD data. A laser powder bed fusion (L-PBF), one of the AM technologies, is able to form the metal three dimensional (3D) objects from metal powder by building it layer-by-layer. Generally, intensity distribution of the laser beam employed by L-PBF is Gaussian. Therefore, these beam shape has energy gradient. It is difficult to fabricate with high precision due to metal powder is aggregated at the lower energy area of beam spot. In this study, fabricated with L-PBF for the purpose to clarify the effects of energy gradient of beam spot on surface roughness Ra of 3D objects. As the evaluation method of 3D objects fabricated with L-PBF, it is employed to measuring surface roughness Ra and Vickers hardness.

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