Powder bed fusion additive manufacturing promotes material efficiency as a unique selling point. Unfused particles are in effect recyclable after processing operation and reused [link]. Powder characteristics however tend to vary following different stages of the AM process and these variations could affect powder behaviour and final part quality. Specifically, feedstock quality must be tightly controlled due to their influence on powder flow and packing density.
Depending on the mechanism involved in its creation, each type of particles has specific physical characteristics that can impact powder recyclability and contribute defects to the final products. Two key mechanisms are responsible for spatter formation and powder bed denudation in the vicinity of the laser track. Let’s have a look at these.
So it’s best to make sure you have all the unbiased facts at hand to invest your cash sensibly.
In the next 3 articles, we’ll review the points you will want to keep in mind before you invest in AM technology. Hardware, ease of use, maintenance and end-products quality are a few topics you’ll want to discuss in detail with the suppliers. In the first part, let’s have a look at the hardware itself and what you should pay attention to.
Powder recycling is accepted as a key commercial advantage in Selective Laser Melting technology. Yet, surprisingly, little to no information is publicly available on this topic. So what’s the catch?
Selective laser melting (SLM) is used to manufacture a patient-specific stainless steel positioning guide for spinal screws. The screws are successfully inserted in the neck vertebrae of a 3-year old patient to strengthen unstable joints. This article highlights the challenges and describes the steps used to design, customise, build and post-process the component.
May arise from powder surface chemistry modification and/or trapped gas in particles that are released during melting and locked in during solidification
May also be due to key-hole effect for deep melt pools.
The latest of academic R&D dedicated to 3D printing of high-value metal components