In recent years, the Directed Energy Deposition (DED) method using Inconel 718, in which supplied metal powder is melted by high energy laser and metal layers are deposited layer by layer, has been actively studied and attracted in the aerospace industry. Voids generated in the deposited part cause deterioration of the mechanical strength. Hence, avoiding voids is one of the most important issues in the DED process. In this study, the mechanism in which voids are generated was investigated by observing the porosity rate, analyzing gas included in voids and observing thermal distribution during the deposition process. The result indicated that the deposition with a laser power of 2000 W and a feed rate of 1000 mm/min has the lowest porosity, and constant laser energy density is effective to keep the constant porosity. Furthermore, Argon gas for shield and most atmospheric components were detected in the voids of the deposited part by analyzing gas in the voids.
|ジャーナル||Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering|
|出版ステータス||Published - 2018|
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