Fabrication of Cu-Al-Ni Shape Memory Alloy by Selective Laser Melting Process

2018 ◽  
Vol 941 ◽  
pp. 1570-1573
Author(s):  
Ken Imai ◽  
Toshi Taka Ikeshoji ◽  
Kazuya Nakamura ◽  
Motonori Nishida ◽  
Yuji Sugitani ◽  
...  
Keyword(s):  
Shape Memory ◽  
Selective Laser Melting ◽  
Elastic Anisotropy ◽  
Copper Alloys ◽  
Three Dimensional ◽  
Melting Process ◽  
Laser Melting ◽  
Good Shape ◽  
Ni Alloy ◽  
Scan Speed

Additive manufacturing (AM) is a prominent technology in the industrial fields such as aerospace, medical, automotive and so on. Especially, selective laser melting (SLM) process is available to create three-dimensional complicated structures of various alloys such as stainless steel, titanium alloy, aluminium alloy, nickel-based superalloy and so on. And also, copper and copper alloys are used as a material for products with complicated shape, electrical components, and a heat exchanger because of having the high electrical conductivity and the high thermal conductivity. It is known that copper alloys show a good shape memory behaviour by adding Al, Ni and Zn. Especially, Cu-Al-Ni alloy shows a good shape memory properties at high temperature. However, it is difficult to fabricate high-density Cu-Al-Ni alloy by the SLM process. This is mainly because Cu-Al-Ni alloy has high elastic anisotropy and brittleness in polycrystalline state. In this research, the optimum fabrication condition of Cu-Al-Ni alloy by SLM process was investigated. The optimum laser power and scan speed were able to be found by evaluating the surface morphology, density and microstructure of the as-build specimens.The maximum density of the as-built specimen was 99.47%.

Microstructure Characterization of AlSi10Mg Fabricated by Selective Laser Melting Process

2018 ◽  
Vol 941 ◽  
pp. 1437-1442
Author(s):  
Takashi Maeshima ◽  
Keiichiro Oh-Ishi ◽  
Hiroaki Kadoura ◽  
Masashi Hara
Keyword(s):  
Selective Laser Melting ◽  
Molten Pool ◽  
Three Dimensional ◽  
Melting Process ◽  
Powder Layer ◽  
Base Temperature ◽  
Fish Scale ◽  
Laser Melting ◽  
Microstructure Observation ◽  
Three Dimensional Finite Element

Multi-scale microstructure observation and three dimensional finite element thermal analysis of AlSi10Mg alloy fabricated by selective laser melting (SLM) process were demonstrated in order to understand the microstructure formation process during SLM fabrication. The unique hierarchically microstructures were observed: (1) the “fish scale” microstructure corresponding to a part of molten pool consists of columnar and equiaxed grains and (2) these grains contain a substructure of α-Al surrounded by Si particles. It is revealed that a supersaturated Si concentration due to the predicted rapid cooling rate on the order of 106 oC/s. In addition, the base temperature during the fabrication increases gradually with some peak temperature of each laser path as the laser scan has proceeded on a powder layer. Although the thermal changes cause no melting of the AlSi10Mg except directly fused region by selective laser so called molten pool, those are capable of causing precipitation and/or clustering.

scholarly journals Visualization of the process of selective laser melting

2019 ◽  
Author(s):  
Андрей Молотков ◽  
Andrey Molotkov ◽  
Ольга Третьякова ◽  
Ol'ga Tret'yakova
Keyword(s):  
Selective Laser Melting ◽  
New Technology ◽  
Three Dimensional ◽  
Melting Process ◽  
Laser Fusion ◽  
Technological Parameters ◽  
Laser Melting ◽  
Advantages And Disadvantages ◽  
Big Picture ◽  
Level Of Training

This paper deals with the visualization of the previously simulated by the authors selective laser melting process in order to simplify the analysis of the results and the selection of technological parameters of the additive production unit. The article presents two possible approaches for visualization of the selective laser fusion process and supported functions which simplify the work and research in the framework of the new technology. The implemented approaches will reduce the requirements for the level of training of specialists working on Russian-made equipment. In the two-dimensional visualization mode, the emphasis is on the possibility of a more detailed study of the process. In a three-dimensional there is the ability of the broader scope and to see the big picture. Several implemented principles of geometry simplification for visual representation are considered. The advantages and disadvantages of the work done and the results obtained are presented.

Selective laser melting of high aspect ratio 3D nickel – titanium structures for MEMS applications

2005 ◽  
Vol 890 ◽  
Author(s):  
Paul Chalker ◽  
Adam Clare ◽  
Sean Davies ◽  
Christopher J. Sutcliffe ◽  
Sozon Tsopanos
Keyword(s):  
Aspect Ratio ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
High Aspect Ratio ◽  
Three Dimensional ◽  
Nickel Titanium ◽  
Niti Shape Memory Alloy ◽  
Laser Melting ◽  
Microelectromechanical Devices ◽  
First Time

ABSTRACTSelective laser melting has been used to build high aspect ratio, three-dimensional NiTi components for the first time. The influence of laser dwell time and raster pitch on the density of NiTi shape memory alloy parts and their resolvable feature sizes are reported. The properties of shape memory springs produced by this method are reported and the application of selective laser melted NiTi components in microelectromechanical devices is discussed.

Three-Dimensional Temperature Gradient Mechanism in Selective Laser Melting of Ti-6Al-4V

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
C. H. Fu ◽  
Y. B. Guo
Keyword(s):  
Temperature Gradient ◽  
Selective Laser Melting ◽  
Molten Pool ◽  
Three Dimensional ◽  
Melting Process ◽  
Layer By Layer ◽  
Laser Melting ◽  
Transient Nature ◽  
Melting Pool ◽  
Three Dimensional Finite Element

Selective laser melting (SLM) is widely used in making three-dimensional functional parts layer by layer. Temperature magnitude and history during SLM directly determine the molten pool dimensions and surface integrity. However, due to the transient nature and small size of the molten pool, the temperature gradient and the molten pool size are challenging to measure and control. A three-dimensional finite element (FE) simulation model has been developed to simulate multilayer deposition of Ti-6Al-4 V in SLM. A physics-based layer buildup approach coupled with a surface moving heat flux was incorporated into the modeling process. The melting pool shape and dimensions were predicted and experimentally validated. Temperature gradient and thermal history in the multilayer buildup process was also obtained. Furthermore, the influences of process parameters and materials on the melting process were evaluated.

Influence of forming conditions on the titanium model in rapid prototyping with the selective laser melting process

2003 ◽  
Vol 217 (1) ◽  
pp. 119-126 ◽  
Author(s):  
F Abe ◽  
E Costa Santos ◽  
Y Kitamura ◽  
K Osakada ◽  
M Shiomi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Rapid Prototyping ◽  
Selective Laser Melting ◽  
Pure Titanium ◽  
Melting Process ◽  
Yttrium Aluminium Garnet ◽  
Laser Melting ◽  
Selective Laser Melting Process ◽  
Scan Speed

In order to evaluate the titanium model to be used for medical purposes in rapid prototyping with the selective laser melting process, the influence of forming conditions on the mechanical properties is investigated. The density and mechanical properties such as tensile and fatigue strengths of the model are measured. In the selective laser melting process, a pulsed yttrium aluminium garnet (YAG) laser with average power of 50 W and maximum peak power of 3 kW is used. The specimens for measuring density and mechanical properties are made from commercial pure titanium powders (grade 1) in a controlled atmosphere with argon gas. It is found that the relative density of the model is higher than 92 per cent and some powder particles remain within the solidified model. The scan speed affects the tensile strength strongly and the tensile strength is around 120 per cent of the standard value of the solid pure titanium when the scan speed is appropriate. However, the fatigue strength is low, about 10 per cent of the solid one, which is still to be improved by post-processing.

Three-dimensional numerical simulation of selective laser melting process based on SPH method

2021 ◽  
Vol 71 ◽  
pp. 224-236
Author(s):  
Yunji Qiu ◽  
Xiaofeng Niu ◽  
Tingting Song ◽  
Mengqing Shen ◽  
Wenqi Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Selective Laser Melting ◽  
Three Dimensional ◽  
Melting Process ◽  
Laser Melting ◽  
Sph Method ◽  
Selective Laser Melting Process

scholarly journals Influence of the Main Parameters of Selective Laser Melting on Stability of Single Track Formation when ‘Growing’ Parts from Copper Alloys

2019 ◽  
pp. 20-29 ◽  
Author(s):  
A.G. Grigoriyants ◽  
D.S. Kolchanov ◽  
A.A. Drenin ◽  
A.O. Denezhkin
Keyword(s):  
Selective Laser Melting ◽  
Copper Alloys ◽  
Melting Process ◽  
Scanning Speed ◽  
Single Track ◽  
Optimal Parameters ◽  
Laser Melting ◽  
Track Formation ◽  
The Stability ◽  
Lower Limits

Selective laser melting technology has the ability to directly produce finished parts, and is economically efficient for single or small batch production. Copper and its alloys are of great interest due to their high thermal and electrical conductivity. The influence of build process parameters, such as scanning speed and layer thickness on the stability of single track formation using a heat-resistant copper alloy PR-BrKh was investigated in this paper. The mechanism of single track formation was studied. As a result, patterns of formation of a stable single track were established, the upper and lower limits of the build parameters were determined. The results of the study provide a deeper understanding of the copper alloys selective laser melting process and may serve as a basis for determining the optimal parameters’ range for ‘growing’ solid structures.

scholarly journals Improving surface quality in selective laser melting based tool making

2021 ◽  
Author(s):  
Filippo Simoni ◽  
Andrea Huxol ◽  
Franz-Josef Villmer
Keyword(s):  
Surface Roughness ◽  
Additive Manufacturing ◽  
Surface Quality ◽  
Selective Laser Melting ◽  
Melting Process ◽  
Laser Remelting ◽  
Laser Melting ◽  
Great Cost ◽  
Starting Point ◽  
Processing Techniques

AbstractIn the last years, Additive Manufacturing, thanks to its capability of continuous improvements in performance and cost-efficiency, was able to partly replace and redefine well-established manufacturing processes. This research is based on the idea to achieve great cost and operational benefits especially in the field of tool making for injection molding by combining traditional and additive manufacturing in one process chain. Special attention is given to the surface quality in terms of surface roughness and its optimization directly in the Selective Laser Melting process. This article presents the possibility for a remelting process of the SLM parts as a way to optimize the surfaces of the produced parts. The influence of laser remelting on the surface roughness of the parts is analyzed while varying machine parameters like laser power and scan settings. Laser remelting with optimized parameter settings considerably improves the surface quality of SLM parts and is a great starting point for further post-processing techniques, which require a low initial value of surface roughness.

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