Researchers report powder-size driven melt pool engineering approach for microstructure control

April 19, 2024

April 19, 2024

PSD-driven microstructure control in DED process (From the paper ‘Powder-size driven facile microstructure control in powder-fusion metal additive manufacturing processes’ by S Chandra et al., Nature Communications)
PSD-driven microstructure control in DED process (From the paper ‘Powder-size driven facile microstructure control in powder-fusion metal additive manufacturing processes’ by S Chandra et al., Nature Communications)

Researchers at Nanyang Technological University and the National University of Singapore have published a paper investigating microstructure control in the metal Additive Manufacturing process. The paper, titled “Powder-size driven facile microstructure control in powder-fusion metal Additive Manufacturing processes,” appears in the journal Nature and explains how the ability to control microstructural evolution during part fabrication can be beneficial in producing complex shapes with predictable mechanical properties.

Moreover, the ability to tailor the microstructure should be adaptable to various AM techniques, state the authors. This is particularly demanded for stainless steel 316 L due to its widespread applications for general purposes in many industry sectors under harsh and corrosive environments.

Subscribe to our weekly newsletter
Sign up

The paper reports a powder-size-driven melt pool engineering approach that demonstrates facile and large-scale control in the grain morphology by triggering a counterintuitive response of powder size to the additively manufactured 316 L stainless steel microstructure. The researchers obtained coarse-grained (>100 μm) or near-monocrystalline microstructure using fine powders and near-equiaxed, fine-grained (<10 μm) microstructure using coarse powders.

This approach reportedly shows adaptability to Directed Energy Deposition and Powder Bed Fusion with no added cost, where the particle-size dependent powder-flow preheating effects and powder-bed thermophysical properties drive the microstructural variations.

The work looks to present a pathway for leveraging feedstock particle size distribution towards more controllable, cost-effective, and sustainable metal Additive Manufacturing.

To read the full article, click here.

Download Metal AM magazine
April 19, 2024

In the latest issue of Metal AM magazine

Download PDF

Extensive AM industry news coverage, as well as the following exclusive deep-dive articles:

  • Metal powders in Additive Manufacturing: An exploration of sustainable production, usage and recycling
  • Inside Wayland Additive: How innovation in electron beam PBF is opening new markets for AM
  • An end-to-end production case study: Leveraging data-driven machine learning and autonomous process control in AM
  • Consolidation, competition, and the cost of certification: Insight from New York’s AM Strategies 2024
  • Scandium’s impact on the Additive Manufacturing of aluminium alloys
  • AM for medical implants: An analysis of the impact of powder reuse in Powder Bed Fusion

The world of metal AM to your inbox

Don't miss any new issue of Metal AM magazine, and get the latest industry news. Sign up to our twice weekly newsletter.

Sign up

Discover our magazine archive…

The free to access Metal Additive Manufacturing magazine archive offers unparalleled insight into the world of metal Additive Manufacturing from a commercial and technological perspective through:

  • Reports on visits to leading metal AM part manufacturers and industry suppliers
  • Articles on technology and application trends
  • Information on materials developments
  • Reviews of key technical presentations from the international conference circuit
  • International industry news

All past issues are available to download as free PDFs or view in your browser.

Browse the archive

Looking for AM machines, metal powders or part manufacturing services?

Discover suppliers of these and more in our comprehensive advertisers’ index and buyer’s guide, available in the back of Metal AM magazine.

  • AM machines
  • Process monitoring & calibration
  • Heat treatment & sintering
  • HIP systems & services
  • Pre- & post-processing technology
  • Powders, powder production and analysis
  • Part manufacturers
  • Consulting, training & market data
View online
Share via
Copy link
Powered by Social Snap