Parameter Development for Laser Powder Bed Fusion of 4340 Steel at 60-micron Layers
Abstract
Process parameters were developed by the U.S. Army Combat Capabilities Development Command (DEVCOM) Armaments Center (AC), Picatinny Arsenal, NJ, for laser powder bed fusion (L-PBF) of 4340 steel on an EOS M290 three-dimensional (3D) printer at 60-micron layer thickness to decrease build time (approximately 33 percent) as compared to previously developed 4340 steel parameters at 40-micron layer thickness. Optimal process parameters (hatch distance and laser scan speed) were selected based on the highest specimen density produced from an experiment where these parameters were varied. A verification build was then built with the optimized parameter set. It consisted of X, Y, and Z-oriented tensile coupons in five locations (four corners and the center of the build plate). The tensile specimens were then machined, heat treated, and characterized. Two tensile blocks were removed from the front of the build plate due to spatter particles that settled on the tensile blocks which could have caused the recoater blade to jam. All but one specimen in the front of the build platform met wrought 43-40 steel minimum requirements.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2024
- Accession Number
- AD1228124
Entities
People
- Elias Jelis
- Matthew Feurer