[T1] Powder Production

[15P-T1-11] The Effect of Powder Oxygen Content on the Formation of Defects in As-Built during the Directed Energy Deposition (DED) Process

*G. Baek^{1, 2}, S. J. JO^{1, 2}, H. Kim^{1, 2}, S. Hong^{1, 2} (1.Kongju National University, Korea, 2.Center for Advanced Materials and Parts of Powders (CAMP2), Korea)

Keywords:Powder Characterization, Direct Energy Deposition, CoCrFeMnNi

Metal additive manufacturing enables the fabrication of complex shapes which are not achievable with conventional casting methods. It produces fine microstructures with superior mechanical properties due to rapid cooling and high thermal gradients. For these reasons, additive manufacturing is applied to various fields such as aerospace, medical, defense, etc. To achieve high relative density of as-built, it is important to control the defects like keyholes, lack of fusions, and cracks. The research has focused on controlling the process variables such as laser power, scan speed, and powder feeding rate. However, research on the effect of powder characteristics on the additive manufacturing process is limited. So, in this study, the effect of powder oxygen content on the formation of cracks and porosity in CoCrFeMnNi alloy during the Directed Energy Deposition (DED) process was analyzed to understand the underlying causes.