Abstract Scope |
During the laser powder bed fusion (LPBF) process, keyhole pores or lack of fusion pores may form depending on the energy density used to fabricate the part. In this study, different levels of energy density are used to study the pores formed within the 2.5 mm × 2.5 mm × 1 mm Inconel 625 specimen. Micro-CT is used to characterize and measure the pores, and the results show that the keyhole porosity increases with an increase in energy density within the keyhole regime. In contrast, a lack of fusion porosity increased with a decrease in energy density. Besides, metallography is performed to observe the melt profile and the pores. The keyhole pores are a result of deep penetration melting and form within the track. In contrast, the lack of fusion pores formed between the tracks, due to incomplete melting of the tracks, or improper overlap between the scan tracks. |