Processing Windows for Ni625 Alloy Using Direct Energy Deposition

This technical report presents the development of process windows for Ni625 alloy fabricated using a Nikon Lasermeister laser powder direct energy deposition (LP-DED) system. The report outlines the correlation between laser power, scan speed, and effective energy density, established through an examination of the microstructure and mechanical properties of the alloy. The study reveals that all samples exhibit a bimodal microstructure consisting of equiaxed and columnar dendrite grains, with dendrite arm spacing decreasing as scan speed increases. The tensile properties show minimal variation, with ultimate tensile and yield strengths reported within specific ranges. The findings demonstrate the manufacturability of Ni625 alloy across various parameter sets, indicating that multiple process recipes can achieve similar results. The research aims to enhance understanding of the relationship between processing parameters and material properties, contributing to the effective use of Ni625 alloy in additive manufacturing applications.