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

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

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