scholarly journals Fabrication and Characterization of High Strength Al-Cu Alloys Processed Using Laser Beam Melting in Metal Powder Bed

2014 ◽  
Vol 56 ◽  
pp. 135-146 ◽  
Author(s):  
Bhrigu Ahuja ◽  
Michael Karg ◽  
Konstantin Yu. Nagulin ◽  
Michael Schmidt
Keyword(s):  
Laser Beam ◽  
Metal Powder ◽  
High Strength ◽  
Powder Bed ◽  
Cu Alloys ◽  
Laser Beam Melting ◽  
Fabrication And Characterization

scholarly journals A ROUND ROBIN STUDY FOR LASER BEAM MELTING IN METAL POWDER BED

2016 ◽  
Vol 27 (2) ◽  
Author(s):  
Bhrigu Ahuja ◽  
Adam Schaub ◽  
Daniel Junker ◽  
Michael Karg ◽  
Felix Tenner ◽  
...  
Keyword(s):  
Laser Beam ◽  
Metal Powder ◽  
Round Robin ◽  
Powder Bed ◽  
Laser Beam Melting

scholarly journals Carbon Particle In-Situ Alloying of the Case-Hardening Steel 16MnCr5 in Laser Powder Bed Fusion

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 896
Author(s):  
Matthias Schmitt ◽  
Albin Gottwalt ◽  
Jakob Winkler ◽  
Thomas Tobie ◽  
Georg Schlick ◽  
...  
Keyword(s):  
Laser Beam ◽  
Mechanical Strength ◽  
Carbon Content ◽  
Metal Powder ◽  
Case Hardening ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Carbon Particles ◽  
Case Hardening Steel

The carbon content of steel affects many of its essential properties, e.g., hardness and mechanical strength. In the powder bed fusion process of metals using a laser beam (PBF-LB/M), usually, pre-alloyed metal powder is solidified layer-by-layer using a laser beam to create parts. A reduction of the carbon content in steels is observed during this process. This study examines adding carbon particles to the metal powder and in situ alloying in the PBF-LB/M process as a countermeasure. Suitable carbon particles are selected and their effect on the particle size distribution and homogeneity of the mixtures is analysed. The workability in PBF-LB is then shown. This is followed by an evaluation of the resulting mechanical properties (hardness and mechanical strength) and microstructure in the as-built state and the state after heat treatment. Furthermore, potential use cases like multi-material or functionally graded parts are discussed.

Fabrication and Characterization of Si Nano-Columns by Femtosecond Laser

2012 ◽  
Vol 16 ◽  
pp. 15-20 ◽  
Author(s):  
Omid Tayefeh Ghalehbeygi ◽  
Vural Kara ◽  
Levent Trabzon ◽  
Selcuk Akturk ◽  
Huseyin Kizil
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Laser Beam ◽  
Chemical Etching ◽  
Silicon Surface ◽  
Laser Pulses ◽  
Laser Beam Profile ◽  
Fs Laser ◽  
Fabrication And Characterization

We fabricated Si Nano-columns by a femtosecond laser with various wavelengths and process parameters, whilst the specimen was submerged in water. The experiments were carried out by three types of wavelengths i.e. 1030 nm, 515nm, 343nm, with 500 fs laser pulses. The scales of these spikes are much smaller than micro spikes that are constructed by laser irradiation of silicon surface in vacuum or gases like SF6, Cl2. The Si nano-columns of 300 nm or less in width were characterized by SEM measurements. The formation of these Si Nano-columns that were revealed by SEM observation, indicates chemical etching with laser ablation occurred when surface exposed by laser beam. We observed 200 nm spikes height at the center of laser beam profile and the ones uniform in height at lateral incident area.

Fabrication and characterization of a large medical balloon with ultra-high strength

2019 ◽  
Vol 27 (2) ◽  
pp. 129-135
Author(s):  
Bin Yue ◽  
Ping Ye ◽  
Baolin Liu ◽  
Zhaohua Chang
Keyword(s):  
High Strength ◽  
Fabrication And Characterization

Experimental characterization of active magnetic regenerators constructed using laser beam melting technique

2020 ◽  
Vol 174 ◽  
pp. 115297 ◽  
Author(s):  
Kristina Navickaitė ◽  
Jierong Liang ◽  
Christian Bahl ◽  
Sandra Wieland ◽  
Theresa Buchenau ◽  
...  
Keyword(s):  
Laser Beam ◽  
Experimental Characterization ◽  
Laser Beam Melting ◽  
Melting Technique

Quantifying Powder Losses and Analyzing Powder Conditions in order to Determine Material Efficiency in Laser Beam Melting

2016 ◽  
Vol 856 ◽  
pp. 231-237 ◽  
Author(s):  
Max Lutter-Günther ◽  
Alexander Hofmann ◽  
Christoph Hauck ◽  
Christian Seidel ◽  
Gunther Reinhart
Keyword(s):  
Laser Beam ◽  
Experimental Studies ◽  
Manufacturing Processes ◽  
Ecological Evaluation ◽  
Powder Bed ◽  
Material Efficiency ◽  
Laser Beam Melting ◽  
Measurement Results ◽  
Subtractive Manufacturing ◽  
End Use

Laser Beam Melting (LBM) is an additive manufacturing process, which is increasingly applied for the production of end use parts. One advantage of this powder bed fusion technology lies in the high material efficiency in comparison with subtractive manufacturing processes (i. e. milling, lathing). However, only few experimental studies have been conducted on the material efficiency of LBM. For the accurate evaluation of the LBM material efficiency, empirical values for powder losses are required. Furthermore, a lack of terminology for waste types and powder conditions in the context of LBM impedes communication and research on the topic. The presented paper aims to increase the understanding of material efficiency and powder conditions in Laser Beam Melting. A quantitative analysis of waste types is presented for different LBM application scenarios. This sets a basis for the ecological evaluation and comparison with conventional manufacturing processes. In order to achieve the aim, a terminology is introduced for waste types and powder conditions in the context of powder bed-based additive processes. Therefore, considerations regarding powder quality are taken into account. For the quantification of powder losses, the experimental setup and measurement results are described. Furthermore, loss types and their significance are analyzed and discussed.

Fabrication and characterization of monolithic nanoporous copper through chemical dealloying of Mg–Cu alloys

2009 ◽  
Vol 51 (9) ◽  
pp. 2120-2125 ◽  
Author(s):  
Changchun Zhao ◽  
Zhen Qi ◽  
Xiaoguang Wang ◽  
Zhonghua Zhang
Keyword(s):  
Cu Alloys ◽  
Nanoporous Copper ◽  
Fabrication And Characterization

scholarly journals Plasma Spheroidisation of Irregular Ti6Al4V Powder for Powder Bed Fusion

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1763
Author(s):  
Nthateng Nkhasi ◽  
Willie du Preez ◽  
Hertzog Bissett
Keyword(s):  
Particle Size ◽  
Additive Manufacturing ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Metal Powder ◽  
Weight Ratio ◽  
High Strength ◽  
Powder Bed Fusion ◽  
Metal Powders ◽  
Powder Bed

Metal powders suitable for use in powder bed additive manufacturing processes should ideally be spherical, dense, chemically pure and of a specified particle size distribution. Ti6Al4V is commonly used in the aerospace, medical and automotive industries due to its high strength-to-weight ratio and excellent corrosion resistance properties. Interstitial impurities in titanium alloys have an impact upon mechanical properties, particularly oxygen, nitrogen, hydrogen and carbon. The plasma spheroidisation process can be used to spheroidise metal powder consisting of irregularly shaped particles. In this study, the plasma spheroidisation of metal powder was performed on Ti6Al4V powder consisting of irregularly shaped particles. The properties of the powder relevant for powder bed fusion that were determined included the particle size distribution, morphology, particle porosity and chemical composition. Conclusions were drawn regarding the viability of using this process to produce powder suitable for additive manufacturing.

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