Process control in powder bed fusion of reactive metal powders: oxides, hydroxides, hydrated oxides and water films
The limited understanding of the complex relationships between alloy composition, temperature, relative humidity, oxide coverage, and the effects of these parameters on processing and powder flow motivates a key question: how much variation can be expected during powder bed fusion. In other words, how are additively manufactured parts and their properties affected at the current level of atmosphere control during storage and machining of powders?
Effect of particles size distribution and packing density on the formation of balling defects during SLM of In718
Balling is a defect that can occur when the molten pool created during selective laser melting (SLM=L-PBF) becomes discontinuous and breaks into separated islands. In this post, we report and discuss how the powder particle arrangement impact the bead geometry and formation of balling defects during SLM.
Direct Laser Deposition (DLD) is a type of laser-based additive manufacturing process used to create functional metal components layer by layer using a sliced 3D CAD (computer aided drawing) file. Unlike Selective Laser Melting which utilizes a bed of powder metal that is ‘selectively’ melted via a laser, DLD is based on melting feedstock (blown powder or wire) at the focus point of a laser source. In this post, we address the residual stresses occurring during the build of metal components with DLD technology .
A356 aluminium alloy (AlSi7Mg0.3) is widely used for gravity casting. Its good ductility, strength and corrosion resistance properties make it a compelling material for components requiring high reliability. Examples of parts traditionally built using A356 include engine parts, hydraulic components, brackets, housing covers in automotive, aerospace, and machinery industries [1, 2].
In this post we present the superior mechanical properties of A356 components showing 99.8% relative density  and built on the EOSINT M280.
Nickel-based superalloys have great applications in the fabrication of turbine blades, jet engines, and other high-value metal components found in marine applications, industrial or nuclear reactors. Using additive manufacturing technology to build these components can offer significant benefits. However, the laser processability of these alloys shows they are prone to cracking.
We provide practical and actionable info dedicated to additive manufacturing of high-value metal components