On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing

Haberland, Christoph; Elahinia, Mohammad; Walker, Jason; Meier, Horst; Frenzel, Jan

doi:10.1088/0964-1726/23/10/104002

Cited by 260 publications

(190 citation statements)

References 38 publications

Supporting

Mentioning

184

Contrasting

Order By: Relevance

“…Additive manufacturing also provides the opportunity to fabricate parts with very complex geometries. Therefore, there are many ongoing research projects (Haberland et al, 2014(Haberland et al, , 2013 to facilitate and optimize the additive manufacturing process for Nitinol components in biomedical applications.…”

Section: Future Work and Challengesmentioning

confidence: 99%

Fatigue of Nitinol: The state-of-the-art and ongoing challenges

Mahtabi

Shamsaei

Mitchell³

2015

Journal of the Mechanical Behavior of Biomedical Materials

162

View full text Add to dashboard Cite

Section: Future Work and Challengesmentioning

confidence: 99%

Fatigue of Nitinol: The state-of-the-art and ongoing challenges

Mahtabi

Shamsaei

Mitchell³

2015

Journal of the Mechanical Behavior of Biomedical Materials

162

View full text Add to dashboard Cite

“…First, oxygen and carbon [11] pick-up are known to affect the transformation criteria with powder metallurgy parts containing 1500-3000 ppm oxygen levels [12]. Oxygen and carbon pick-up have been shown to increase linearly in relation to energy density of lasermelted NiTi [13]. Therefore, to keep impurity pick-up to a minimum, this study uses the lowest possible energy density to produce dense (i.e., over 99% density) parts with varied scanning parameters.…”

Section: Introductionmentioning

confidence: 99%

On the Transformation Behavior of NiTi Shape-Memory Alloy Produced by SLM

Speirs

Wang

Baelen

et al. 2016

Shap. Mem. Superelasticity

106

View full text Add to dashboard Cite

Selective laser melting has been applied as a production technique of nickel titanium (NiTi) parts. In this study, the scanning parameters and atmosphere control used during production were varied to assess the effects on the final component transformation criteria. Two production runs were completed: one in a high (*1800 ppm O 2 ) and one in a low-oxygen (*220 ppm O 2 ) environment. Further solution treatment was applied to analyze precipitation effects. It was found that the transformation temperature varies greatly even at identical energy densities highlighting the need for further in-depth investigations. In this respect, it was observed that oxidation was the dominating factor, increased with higher laser power adapted to higher scanning velocity. Once the atmospheric oxygen content was lowered from 1800 to about 220 ppm, a much smaller variation of transformation temperatures was obtained. In addition to oxidation, other contributing factors, such as nickel depletion (via evaporation during processing) as well as thermal stresses and textures, are further discussed and/or postulated. These results demonstrated the importance of processing and material conditions such as O 2 content, powder composition, and laser scanning parameters. These parameters should be precisely controlled to reach desired transformation criteria for functional components made by SLM.

show abstract

“…58). Nowadays, the weak point for Additive Manufacturing of SMA parts, that needs to be studied and improved, is not too much related to structural properties such as density, impurity content and mechanical behavior, but to Shape Memory Effect and superelasticity (Arghavani et al, 2011;Auricchio, 2009;Auricchio et al, 2009;Darijani and Naghdabadi, 2010;Frick et al, 2005;Hohne et al, 2003;Haberland et al, 2014;Schrooten et al, 2002;Machado and Savi, 2003;Mustafa et al, 2015;Nicholas et al, 2014;Otsuka and Wayman, 1998;SchmidtMende and Reiss, 1991;Wayman and Duerig, 1988).…”

Section: Future Perspectives For Use Of Smas In Industrial Design Appmentioning

confidence: 99%

Advanced Manufacturing for Novel Materials in Industrial Design Applications

Tamburrino¹,

Apicella²,

Aversa³

et al. 2018

American Journal of Engineering and Applied Sciences

View full text Add to dashboard Cite

Abstract:The research presented starts with a focus on Smart Materials, or rather materials with properties that react to external stimuli (temperature, electric or magnetic field, pH or mechanical stress, for example) related to the environmental changes, modifying one or some of their own properties (mechanical, electrical, appearance, etc.). Afterward, one category of Smart Materials, Shape Memory Alloys (SMAs), has been investigated with the aim to develop an industrial application. In particular, a smart and active shadow system for thermal comfort of urban or indoor environments, based on the valorization of the unique property of SMAs to change their shape depending on the temperature (SME, Shape Memory Effect). Without the need to use expensive and complex mechanical system composed of many parts to assemble and characterized by higher cost of energy required for its functioning and its manufacturing. In order to develop the system, SMAs like Nitinol (Ni-Ti) wires with a diameter of 0,75 mm (Austenite finish 85°C) have been studied. Particularly, DSC (Differential Scanning Calorimetry) thermal analysis, aimed to investigate a characteristic range of temperature for martensitic and austenitic transformations and get data to plan more suitable and optimized procedures, conditions and parameters for heat treatments needed for Nitinol training have been carried out. In parallel, CAD models have been developed to simulate and better understand forces needed for a proper functioning of the smart shadow system, to predict its behavior, to have a support for a correct choice of SMA wires (selecting wires with a diameter suitable to produce a force high enough to produce strains), to decide wires positioning and quantity. Finally, for "as-drawn" Nitinol wires, using the data experimentally collected with DSC thermal analysis, SME training procedures have experimented. With the wires, programmed to have a two-way memory effect, using milling and additive technologies, prototypes where the wires are embedded in casted polymers (rubber silicone or polyurethane) or assembled to parts manufactured with additive technologies have been built, in order to test and enhance product functioning and manufacturability. The results obtained for the application, although the Smart Shadow System is not completely engineered and other evolutionary steps for it are possible, show that the use of SMAs gives the possibility to have an active system able to be weather responsive, ensuring a significant shape memory effect depending on the temperature. This advanced property, in fact, gives the possibility, optimizing functioning parameters (temperatures, thicknesses, geometry, structure), to have a sensitive, adaptive and smart system that can ensure the best thermal condition for any meteorological situation.

show abstract

On the development of high quality NiTi shape memory and pseudoelastic parts by additive manufacturing

Cited by 260 publications

References 38 publications

Fatigue of Nitinol: The state-of-the-art and ongoing challenges

Fatigue of Nitinol: The state-of-the-art and ongoing challenges

On the Transformation Behavior of NiTi Shape-Memory Alloy Produced by SLM

Advanced Manufacturing for Novel Materials in Industrial Design Applications

Contact Info

Product

Resources

About