Effect of laser rescanning on the grain microstructure of a selective laser melted Al-Mg-Zr alloy
By S. Griffiths, Marta D. Rossell, J. Croteau, Nhon Q. Vo, D. Dunand, Christian Leinenbach. Materials Characterization, 2018
200 citations recorded by the source corpus.
Abstract The microstructures of alloys created via Additive Manufacturing (AM) can vary substantially from those present in cast or wrought products, due to the very rapid solidification associated with AM. While numerous studies have investigated the process-microstructure relationship of alloys created by Selective Laser Melting (SLM), few have investigated the effects of laser rescanning to alter the microstructure or take advantage of the rapid solidification conditions the process provides. This study investigates the effect of single- or multiple pass laser scanning upon the grain structure of Addalloy™, a new Al-Mg-Zr alloy strengthened via L12 Al3Zr precipitates. The bottom of the melt pools consisted of fine equiaxed grains (1.3 μm) that nucleated from primary Al3Zr (100–400 nm) precipitates. The top of the melt pool consists of columnar grains (up to 40 μm long), consistent with lack of Al3Zr nucleants due to Zr solute trapping from increased solidification velocities. Additional laser scanning (a second or third scan) reduces the amounts of columnar grains and increased the number equiaxed grains. The change is attributed to a shallower melt pool remelting the columnar grain region upon rescanning, due to reduced laser energy absorption and increased heat losses in the solid.
Subfields: Aerospace Engineering, Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/ffacd6f4c0456820e5d39f180d24a2d7fd552b9d
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Citations in the corpus
- A review of Laser Powder Bed Fusion Additive Manufacturing of aluminium alloys: Microstructure and properties (2021, background): “However, this non-uniformity can be reduced by applying multiple scans [147].”
- 3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting (2019, background): “The addition of Sc and Zr to the Al-Mg alloy to develop new compositions, such as AddalloyTM [137], refined the microstructure and strengthened the material [138].”