| 초록 |
As additive manufacturing (AM) technologies allow for the rapid fabrication of metallic parts with complex geometries, they have attracted significant interest in various industries. Many studies have focused on the characterization of metal powders used for AM and the optimization of process parameters to increase the applicability of AM technologies to various fields. In addition, many researchers have evaluated the mechanical properties of additively manufactured specimens to ensure the safety and reliability of the parts made by AM. In the present study, we investigated the weldability of additively manufactured specimens. 316L stainless steel powder, one of the most commonly used materials for AM, and powder bed fusion process were employed to fabricate the rectangular specimens with the thickness of 4 mm. To evaluate the weldability of the specimens, Varestraint tests were carried out and total crack length was used as an index of hot cracking susceptibility. The results showed that the additively manufactured 316L stainless steel specimens had much higher susceptibility to hot cracking than conventional wrought 316L stainless steel. Meanwhile, hot isostatic pressing after the AM was found to significantly decrease the cracking susceptibility. |
