レーザーピーニングによる金属積層造形材の応力改質に関する研究

Study on stress modification of metal additive manufacturing materials by laser peening

菖蒲 敬久  ; 冨永 亜希; 木曽原 直之 ; 前田 敏男*; 山岸 隆一郎*; 沖原 伸一朗*; 坪井 昭彦 

Shobu, Takahisa; Tominaga, Aki; Kisohara, Naoyuki; Maeda, Toshio*; Yamagishi, Ryuichiro*; Okihara, Shinichiro*; Tsuboi, Akihiko

積層造形の課題である表面引張応力改善としてレーザーピーニングが有効であることからその照射前後の応力分布の変化を放射光X線で評価し、明らかに大きく改善があることを明らかにした。

In this study, the internal defects and strain distribution in metal additive manufacturing and their changes by laser peening were evaluated. These studies using X-ray computed tomography and diffraction technique were carried out at BL22XU in synchrotron radiation facility SPring-8. As a result, it was confirmed that a large number of voids existed inside the additive manufacturing. However, almost no difference due to laser peening was confirmed. On the other hand, it was confirmed that the strain inside the additive manufacturing was almost