On the Properties of Ni-Rich NiTi Shape Memory Parts Produced by Selective Laser Melting

2012 ◽  
Author(s):  
Christoph Haberland ◽  
Horst Meier ◽  
Jan Frenzel
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Functional Properties ◽  
Processing Route ◽  
Laser Melting ◽  
Elementary Processes ◽  
Near Net Shape ◽  
Manufacturing Technologies ◽  
Niti Shape Memory Alloys

Processing of Nickel-Titanium (NiTi) shape memory alloys (SMAs) is challenging because smallest compositional variances and all types of microstructural features strongly affect the elementary processes of the martensitic transformation and thus the functional properties of the material. Against this background, powder metallurgical near net shape methods are attractive for the production of NiTi components. Especially additive manufacturing technologies (AM) seem to provide high potential, although they have received only little attention for processing NiTi so far. This work is the first to report on pseudoelastic properties of additive manufactured Ni-rich NiTi. We show how to establish pseudoelasticity in NiTi samples prepared by the additive manufacturing technique Selective Laser Melting (SLM). Therefore, we analyze phase transformation behavior, mechanical characteristics and functional properties of our materials subjected to different heat treatments. The obtained results are compared to the behavior of conventional NiTi. The presented results clearly indicate that SLM provides a promising processing route for the fabrication of high quality NiTi parts.

scholarly journals A Short Review on the Microstructure, Transformation Behavior and Functional Properties of NiTi Shape Memory Alloys Fabricated by Selective Laser Melting

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1683 ◽  
Author(s):  
Xiebin Wang ◽  
Sergey Kustov ◽  
Jan Van Humbeeck
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Functional Properties ◽  
Complex Structures ◽  
Transformation Behavior ◽  
Laser Melting ◽  
Niti Shape Memory Alloys

Due to unique functional and mechanical properties, NiTi shape memory alloys are one of the most promising metallic functional materials. However, the poor workability limits the extensive utilization of NiTi alloys as components of complex shapes. The emerging additive manufacturing techniques provide high degrees of freedom to fabricate complex structures. A freeform fabrication of complex structures by additive manufacturing combined with the unique functional properties (e.g., shape memory effect and superelasticity) provide great potential for material and structure design, and thus should lead to numerous applications. In this review, the unique microstructure that is generated by selective laser melting (SLM) is discussed first. Afterwards, the previously reported transformation behavior and mechanical properties of NiTi alloys produced under various SLM conditions are summarized.

scholarly journals In Search of the Optimal Conditions to Process Shape Memory Alloys (NiTi) Using Fused Filament Fabrication (FFF)

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4718
Author(s):  
Pedro Carreira ◽  
Fábio Cerejo ◽  
Nuno Alves ◽  
Maria Teresa Vieira
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Sintering Temperature ◽  
Production Costs ◽  
Layer By Layer ◽  
Secondary Phases ◽  
Fused Filament Fabrication ◽  
Near Net Shape ◽  
Niti Shape Memory Alloys

This research was performed so as to investigate the additive manufacturing of NiTi shape memory alloys, which is associated with direct processes, such as selective laser melting. In addition to its expensive production costs, NiTi readily undergoes chemical and phase modifications, mainly as a result of Ni loss during processing as a result of high temperatures. This research explores the potential usefulness of NiTi as well as its limitations using indirect additive processes, such as fused filament fabrication (FFF). The first step was to evaluate the NiTi critical powder volume content (CPVC) needed to process high-quality filaments (via extrusion). A typical 3D printer can build a selected part/system/device layer-by-layer from the filaments, followed by debinding and sintering (SDS), in order to generate a near-net-shape object. The mixing, extruding (filament), printing (shaping), debinding, and sintering steps were extensively studied in order to optimize their parameters. Moreover, for the sintering step, two main targets should be met, namely: the reduction of contamination during the process in order to avoid the formation of secondary phases, and the decrease in sintering temperature, which also contributes to reducing the production costs. This study aims to demonstrate the possibility of using FFF as an additive manufacturing technology for processing NiTi.

Selective laser melting produced layer-structured NiTi shape memory alloys with high damping properties and Elinvar effect

2018 ◽  
Vol 146 ◽  
pp. 246-250 ◽  
Author(s):  
Xiebin Wang ◽  
Mathew Speirs ◽  
Sergey Kustov ◽  
Bey Vrancken ◽  
Xiaopeng Li ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Damping Properties ◽  
Laser Melting ◽  
Niti Shape Memory Alloys

Design of SLM automatic leveling powder laying mechanism and variable position powder laying movement strategy

2020 ◽  
pp. 1-12
Author(s):  
Yongdi Zhang ◽  
Guang Yang ◽  
Deming Wang ◽  
Haonan Wang
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
High Performance ◽  
Complex Shape ◽  
Precision Manufacturing ◽  
Laser Melting ◽  
Variable Position ◽  
Movement Strategy ◽  
Manufacturing Technologies ◽  
Metal Additive

Additive Manufacturing technology has aroused widespread attention for free designing and rapid prototyping. Selective Laser Melting technology is one of the metal additive manufacturing technologies, and it has become an important choice for precision manufacturing of metal parts with high performance and complex shape. In the process of selective laser melting, the accuracy and efficiency of laying powders directly affect the quality and time of parts printing. In order to realize laying powder accurately and efficiently in printing process, the mechanical mechanism and movement strategy of the powder laying device are studied in this paper. A powder laying mechanism with automatic leveling function is designed. On the premise of ensuring the powder laying accuracy, a variable position powder laying movement strategy is proposed to improve the powder laying efficiency The case analysis results show that the laying powder efficiency has been increased by 49.2%.

Qualität steigern mit Selective Laser Melting/Quality improvement with selective laser melting – An approach to manage requirements with additive manufacturing

2015 ◽  
Vol 105 (11-12) ◽  
pp. 793-797
Author(s):  
J. C. Aurich ◽  
M. Burkhart
Keyword(s):  
Quality Improvement ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
High Accuracy ◽  
Manufacturing Technology ◽  
Laser Melting ◽  
Additive Manufacturing Technology ◽  
Manufacturing Technologies ◽  
Design Freedom

Additive Manufacturing (AM) ist der Überbegriff für unterschiedliche Fertigungsverfahren, welche durch das schichtweise Aufbringen von Werkstoff die Herstellung von Bauteilen ermöglichen. Selective Laser Melting (SLM) ist ein additives Fertigungsverfahren zur Herstellung von Produkten mit hoher Detailgenauigkeit und Designfreiheit. Der Fachbeitrag stellt ein Konzept vor, bei dem durch systematisches Vorgehen untersucht wird, ob Produktanforderungen mit SLM besser erfüllt werden können als mit konventionellen Fertigungsverfahren.   Additive Manufacturing (AM) is the term for various manufacturing technologies that enable manufacturing of components by adding layer after layer of material. Selective Laser Melting (SLM) is an additive manufacturing technology that allows to manufacture products with high accuracy and design freedom. In this article an approach is presented to systematically examine, if product requirements can be fulfilled better with SLM than with conventional manufacturing technologies.

Microstructural Evolution and Functional Properties of Fe-Mn-Al-Ni Shape Memory Alloy Processed by Selective Laser Melting

2016 ◽  
Vol 47 (6) ◽  
pp. 2569-2573 ◽  
Author(s):  
Thomas Niendorf ◽  
Florian Brenne ◽  
Philipp Krooß ◽  
Malte Vollmer ◽  
Johannes Günther ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Functional Properties ◽  
Microstructural Evolution ◽  
Laser Melting
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