Researchers highlight remelting-based microstructure engineering in Additive Manufacturing
December 11, 2024
In a recent paper published by Scripta Materialia, researchers from the University of Toronto demonstrated a new strategy to control the microstructure in Laser Beam Powder Bed Fusion (PBF-LB) through tuning melt pool overlaps, without changing energy densities and scan patterns.
Using 316L stainless steel as an example, the team generated a wide range of grain sizes and morphologies.
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The underlying mechanism was associated with the retainment or elimination of newly nucleated grains at a melt pool during the formation of subsequent melt pools. The propensity of retainment or elimination of grains is largely dependent on the extent of melt pool overlaps, as the grains are prone to nucleate at the free-surfaces of melt pool boundaries, explained the authors.
The researchers have stated that their strategy could be applied to a wide range of metallic alloys, offering a new approach to microstructure engineering in Additive Manufacturing.
The paper ‘Remelting-based microstructure engineering in laser powder bed fusion: A case study in 316L stainless steel,’ by Tianyi Lyu and Yu Zou, is available to download in full from here.
www.utoronto.ca
