Affiliation:
1. Development Department Advanced Manufacturing Business Unit Nikon Corporation 201‐9, Miizugahara Kumagaya‐city Saitama 360‐8559 Japan
2. Mathematical Sciences Research Laboratory Advanced Technology Research & Development Division Nikon Corporation 471, Nagaodai‐cho Yokohama‐city Kanagawa 244‐8533 Japan
3. Morf 3D, Inc. Long Beach CA 90808 USA
Abstract
Herein, a process window is developed for Ni625 alloy fabricated using a Nikon Lasermeister laser powder direct energy deposition (LP‐DED) unit. The process map illustrates the relationship between the laser power, scan speed, and effective energy density, established by examining the correlation between the microstructure and mechanical properties. All samples exhibit a bimodal microstructure comprising equiaxed and columnar dendrite grains, and the dendrite arm spacing decreases with increasing scan speed. The tensile behavior of each sample demonstrates minimal variation, and the values are comparable to those reported previously. The ultimate tensile and yield strengths range from 1008 ± 2 to 941 ± 9 and 682 ± 11 to 640 ± 7 MPa, respectively. This study highlights the remarkable manufacturability of Ni625 alloy for additive manufacturing across diverse parameter sets, demonstrating that a single ideal process set does not exist for each material and machine. Instead, multiple “recipes” may be employed to achieve similar outcomes.