日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
特集「超温度場材料創成学」
μ-Helixスキャンストラテジーと狭ピッチ走査レーザー粉末床溶融結合による316Lステンレス鋼単結晶の育成とプロセスモニタリング
柳 玉恒能勢 和史奥川 将行小泉 雄一郎中野 貴由
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2024 年 88 巻 9 号 p. 190-197

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We first fabricated the single crystal of 316L stainless steel by laser powder bed fusion (L-PBF), focusing on the applicability of the µ-Helix scanning strategy with narrow pitch as a method for obtaining a single crystal. Various combinations of laser power and laser scanning speed were examined. The cubic block samples were orientated to <100> in the X-laser scanning direction, to <110> in the Y-laser scanning direction, and to <110> in the building direction, which is contrary to that obtained by the µ-Helix scanning strategy in electron beam melting (EBM), in which the X- and Y-laser scanning directions are orientated to <110>, and Z-direction is oriented to <100> direction. Also, it has been demonstrated that melt pool monitoring by on-axis and off-axis dual photodiodes can detect the nonequivalence of ±X-scanning and ±Y-scanning, which is responsible for the unexpected crystal orientation.

 

Mater. Trans. 64 (2023) 1135-1142に掲載

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