Optimization of the extrusion rate for different layer thicknesses to achieve controlled mechanical properties in MEX 3D printing of low-alloy steel

• DOI: 10.1016/j.jmapro.2024.05.008
• Publication Date: 2024-05-10T17:54:56Z
• Authors: Abdullah Riaz; Philip Töllner; Tim Dreier; Jamal Nazir; Armin Springer; Hermann Seitz
• Keywords: Molding (decorative); Injection moulding; Layer by layer

Composite extrusion modeling is an advanced material additive manufacturing process that requires fine-tuning of printing parameters for injection molding feedstocks. In order to achieve comparable high-quality parts at different layer thicknesses, the must be optimized respective thicknesses. this work, AISI 8740 low-alloy steel are four The multiplier values each thickness tuned, allowing fine adjustment printer's screw rotation speed every thickness, resulting in all final parts' maximum densities (≥ 98 %) with high accuracies. Scanning electron microscope images, surface roughness measurements, and precision tests proved good printed parts. Young's modulus, tensile yield strengths also raised by ∼24 %, ∼16 % ∼15 respectively, compared non-optimized sintered part. achieved strength range (∼888–947) MPa (∼574–586) were higher than those provided feedstock manufacturer. This promising approach significantly reduces time costs without compromising quality mechanical properties. adjusting methodology allows broader applicability across diverse processes.