Elsevier

Journal of Materials Research and Technology

Volume 14, September–October 2021, Pages 2554-2570
Journal of Materials Research and Technology

Original Article
Laser beam powder bed fusion of nitinol shape memory alloy (SMA)

https://doi.org/10.1016/j.jmrt.2021.07.126Get rights and content
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Abstract

This study is focused on the 3D printing of NiTi shape memory alloy (SMA) in cuboidal shaped samples via the Laser Powder Bed Fusion (L-PBF) process using a dissimilar material build plate of 316L stainless steel. Four processing parameters were investigated at three levels for the optimization of the process. Those parameters were the laser beam power, scanning speed, laser beam spot size and hatch spacing. The produced samples exhibited varying levels of bonding with the substrate. Compression testing, Archimedes density measurement and EDX chemical composition were carried out. A design of experiment model was developed relating the input process parameters to the output properties. The effect of the calculated volumetric energy density and the sample melt-pool temperatures on the output measures were also investigated for the strong bonding and weldability with the substrate metal.

Keywords

Nitinol (NiTi)
Shape memory alloy (SMA)
Laser powder bed fusion
3D printing
Selective laser melting (SLM)
Differential scanning calorimetry (DSC)

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