Review : Importance of Atmospheric Gas Selection in Metal Additive Manufacturing : Effects on Spatter, Microstructure, and Mechanical Properties

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  • Amano Hiroki
    TAIYO NIPPON SANSO Corporation Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Ishimoto Takuya
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University Aluminium Research Center, University of Toyama
  • Nakano Takayoshi
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University Anisotropic Design & Additive Manufacturing Research Center, Osaka University

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  • Review—Importance of Atmospheric Gas Selection in Metal Additive Manufacturing: Effects on Spatter, Microstructure, and Mechanical Properties

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<p>In metal additive manufacturing, it is possible to control the microstructure and the associated mechanical and chemical properties of metal products over a wide range. For example, in laser powder bed fusion (L-PBF), the laser process parameters are considered critical for the fabrication of functional parts. However, the effect of atmospheric gas on L-PBF has not yet been comprehensively documented. In L-PBF, gas flow is used to remove spatter and fumes, preventing degradation of quality due to laser attenuation and spatter contamination of the fabricated product. Thus, the use of atmospheric gas is inevitable in fabrication via L-PBF. In this review, we focus on the use of atmospheric gas in L-PBF, explain the effects of atmospheric gas on the microstructure and mechanical properties of fabricated products, and describe the importance of selecting the right atmospheric gas.</p><p> </p><p>This Paper was Originally Published in Japanese in J. JILM 72 (2022) 220–226. The title was changed due to the addition of “Review—”.</p>

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