Superelastic NiTi Functional Components by High-Precision Laser Powder Bed Fusion Process : The Critical Roles of Energy Density and Minimal Feature Size

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Shuo Qu
  • Junhao Ding
  • Jin Fu
  • Shiming Gao
  • Qingping Ma
  • Hui Liu
  • Mingwang Fu
  • Xu Song

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1436
Journal / PublicationMicromachines
Volume14
Issue number7
Online published18 Jul 2023
Publication statusPublished - Jul 2023

Link(s)

Abstract

Additive manufacturing (AM) was recently developed for building intricate devices in many fields. Especially for laser powder bed fusion (LPBF), its high-precision manufacturing capability and adjustable process parameters are involved in tailoring the performance of functional components. NiTi is well-known as smart material utilized widely in biomedical fields thanks to its unique superelastic and shape-memory performance. However, the properties of NiTi are extremely sensitive to material microstructure, which is mainly determined by process parameters in LPBF. In this work, we choose a unique NiTi intricate component: a robotic cannula tip, in which material superelasticity is a crucial requirement as the optimal object. First, the process window was confirmed by printing thin walls and bulk structures. Then, for optimizing parameters precisely, a Gyroid-type sheet triply periodic minimal-surface (G-TPMS) structure was proposed as the standard test sample. Finally, we verified that when the wall thickness of the G-TPMS structure is smaller than 130 μm, the optimal energy density changes from 167 J/m3 to 140 J/m3 owing to the lower cooling rate of thinner walls. To sum up, this work puts forward a novel process optimization methodology and provides the processing guidelines for intricate NiTi components by LPBF. © 2023 by the authors.

Research Area(s)

  • 3D printing, energy density, laser powder bed fusion, mechanical testing, NiTi alloy, robotic cannula, TPMS lattice

Citation Format(s)

Superelastic NiTi Functional Components by High-Precision Laser Powder Bed Fusion Process: The Critical Roles of Energy Density and Minimal Feature Size. / Qu, Shuo; Wang, Liqiang; Ding, Junhao et al.
In: Micromachines, Vol. 14, No. 7, 1436, 07.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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