[G] Melting and solidification process/High temperature process

[420] Cast Defect of Flame-Retardant Mg Alloy Additive-manufactured by Laser Powder Bed Fusion

*Hirofumi MIYAHARA¹, Ryunosuke SHIMIZU², Yasuaki KUBOTA¹, Shinichiro NAKAZAWA¹, Kaisei AKAO¹, Toshiharu MATSUMOTO³, Kohei MORISHITA¹ (1. Kyushu University, 2. Kyushu University (Present: Nippon Steel Corporation), 3. Tobata seisakusho Co.,Ltd.)

Keywords:レーザ粉末床溶融結合法、難燃性マグネシウム合金、急速凝固、ひけ巣、鋳造欠陥

本研究では，難燃性Mg合金を粉末床溶融結合法により造形させ，レーザ照射条件によりAbnormal lack of fusion，Normal lack of fusion，ひけ巣，keyholeおよびgas porosityの５つの欠陥が生ずることを明らかにした．