Predictive analytical modelling and experimental validation of processing maps in additive manufacturing of nitinol alloys

Zhu, Jia–Ning; Борисов, Е. В.; Liang, Xiaohui; Farber, Eduard; Hermans, M.J.M.; Popovich, Vera

doi:10.1016/j.addma.2020.101802

Cited by 33 publications

(23 citation statements)

References 55 publications

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“…The prospects for further expanding the applicability of Nitinol are inextricably linked with the development of modern technologies, in particular, with the additive manufacturing technologies. To date, there are many scientific works devoted to the production of products from the Nitinol (TiNi) alloy using additive manufacturing technologies and the influence of the process and processing parameters on the final properties of the alloys [4,5]. As a method of obtaining dense products from TiNi alloy, the selective laser melting method is most often considered [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of lattice structures topology on the properties of the TiNi alloy: Computer Simulation

Farber

Orlov

Popovich

2021

METAL Conference Proeedings

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Section: Introductionmentioning

confidence: 99%

Effect of lattice structures topology on the properties of the TiNi alloy: Computer Simulation

Farber

Orlov

Popovich

2021

METAL Conference Proeedings

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“…Measurements of the single beads’ width are essential before printing of 3D objects, in order to avoid multiple remelting of the same powder volume and guarantee the necessary overlap between adjacent tracks. Such analysis was presented for NiTi intermetallic powder in [ 17 , 37 , 45 ], where Realizer SLM 100 (SLM Solutions, Lübeck, Germany), Aconity3D Midi (Aconity3D, Herzogenrath, Germany), and Phenix PXM (now 3D Systems, Rock Hill, SC, USA) installations were used, respectively, all with a laser spot size of 80 μm. The reported results of the single tracks’ width measurements show the same tendencies; however, the values are higher than those obtained in this work.…”

Section: Resultsmentioning

confidence: 99%

“…In the production of parts via the SLM method, an insufficient energy input leads to defects—represented as closed pores with remaining powder—due to lack of fusion, which strongly impairs the mechanical performance of a part [ 37 ]. On the other hand, an excessive energy input will lead to the formation of spherical pores due to solidification of melt pool with captured gas bubbles [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

Selective Laser Melting of Pre-Alloyed NiTi Powder: Single-Track Study and FE Modeling with Heat Source Calibration

2021

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Unique functional properties such as the low stiffness, superelasticity, and biocompatibility of nickel–titanium shape-memory alloys provide many applications for such materials. Selective laser melting of NiTi enables low-cost customization of devices and the manufacturing of highly complex geometries without subsequent machining. However, the technology requires optimization of process parameters in order to guarantee high mass density and to avoid deterioration of functional properties. In this work, the melt pool geometry, surface morphology, formation mode, and thermal behavior were studied. Multiple combinations of laser power and scanning speed were used for single-track preparation from pre-alloyed NiTi powder on a nitinol substrate. The experimental results show the influence of laser power and scanning speed on the depth, width, and depth-to-width aspect ratio. Additionally, a transient 3D FE model was employed to predict thermal behavior in the melt pool for different regimes. In this paper, the coefficients for a volumetric double-ellipsoid heat source were calibrated with bound optimization by a quadratic approximation algorithm, the design of experiments technique, and experimentally obtained data. The results of the simulation reveal the necessary conditions of transition from conduction to keyhole mode welding. Finally, by combining experimental and FE modeling results, the optimal SLM process parameters were evaluated as P = 77 W, V = 400 mm/s, h = 70 μm, and t = 50 μm, without printing of 3D samples.

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“…[ 29 ] Recently, SLM has become very attractive for the fabrication of NiTi components [ 30–34 ] and significant efforts have been mainly focused on the selection of the process parameters that maximize the thermo‐mechanical performance. [ 35–42 ] With this regard, the control of energy input ( E ) is adopted as the main criteria to study the SLM process as it links different process parameters:

E = \frac{P}{t \cdot v \cdot h}

( P is the laser power, t is the layer thickness, v is the scan speed, and h is the hatch distance). [ 43 ] For NiTi alloys, values of E in the range of 55 to 222 J mm −3 provide high density and low porosity level within the produced samples.…”

Section: Introductionmentioning

confidence: 99%

A Study on Damping Property of NiTi Elements Produced by Selective Laser‐Beam Melting

et al. 2021

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The damping properties of NiTi elements produced through selective laser melting are investigated by tuning the process parameters. To this end, twelve parameters’ sets are selected to fabricate fully‐dense NiTi specimens. Damping is evaluated through loss factor index, mechanical loading cycles (up to 104 cycles), solicitation frequency and strain amplitude. Results confirm that NiTi fabricated through selective laser‐beam melting is an excellent candidate to substitute conventional materials when used in the martensite phase. Furthermore, the selected process parameters enable specific damping performances that can be collected in damping maps which turn out to be practical tools for the fabrication of NiTi parts with tunable damping response.

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Predictive analytical modelling and experimental validation of processing maps in additive manufacturing of nitinol alloys

Cited by 33 publications

References 55 publications

Effect of lattice structures topology on the properties of the TiNi alloy: Computer Simulation

Effect of lattice structures topology on the properties of the TiNi alloy: Computer Simulation

Selective Laser Melting of Pre-Alloyed NiTi Powder: Single-Track Study and FE Modeling with Heat Source Calibration

A Study on Damping Property of NiTi Elements Produced by Selective Laser‐Beam Melting

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