scholarly journals Power Density Distribution for Laser Additive Manufacturing (SLM): Potential, Fundamentals and Advanced Applications

Technologies ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 5 ◽  
Author(s):  
Alexander Metel ◽  
Michael Stebulyanin ◽  
Sergey Fedorov ◽  
Anna Okunkova
Keyword(s):  
Additive Manufacturing ◽  
Laser Beam ◽  
Density Distribution ◽  
Power Density ◽  
Selective Laser Melting ◽  
Laser Melting ◽  
Laser Additive Manufacturing ◽  
Power Density Distribution ◽  
Advanced Applications

Problems with the laser additive manufacturing of metal parts related to its low efficiency are known to hamper its development and application. The method of selective laser melting of metallic powders can be improved by the installation of an additional laser beam modulator. This allows one to control the power density distribution optically in the laser beam, which can influence the character of heat and mass transfer in a molten pool during processing. The modulator contributes alternative modes of laser beam: Gaussian, flat top (top hat), and donut (bagel). The study of its influence includes a mathematical description and theoretical characterization of the modes, high-speed video monitoring and optical diagnostics, characterization of processing and the physical phenomena of selective laser melting, geometric characterization of single tracks, optical microscopy, and a discussion of the obtained dependences of the main selective laser melting (SLM) parameters and the field of its optimization. The single tracks were produced using the advanced technique of porosity lowering. The parameters of the obtained samples are presented in the form of 3D graphs. The further outlook and advanced applications are discussed.

Development of 3D Finite Element Model for Predicting Process-Induced Defects in Additive Manufacturing by Selective Laser Melting (SLM)

2016 ◽  
Author(s):  
Bilal Hussain ◽  
A. Sherif El-Gizawy
Keyword(s):  
Additive Manufacturing ◽  
Laser Beam ◽  
Selective Laser Melting ◽  
Thermal Stresses ◽  
Cost Effective ◽  
Element Model ◽  
Laser Melting ◽  
Two Phase ◽  
Free Process ◽  
Manufacturing Techniques

Selective Laser Melting (SLM) is one of the important Additive Manufacturing techniques for building functional products. Nevertheless, the absence of accurate models for predicting the SLM process behavior, delays development of cost effective and defects free process. This work presents a coupled thermo-mechanical numerical model to capture the two phase (solid-liquid) solidification melting phenomena that occur in the process. The proposed model will also predict the evolvement of process-induced properties and defects particularly residual stresses caused by temperature gradient and thermal stresses. CO2 or Nd:YAG laser beam can be used as a heat source with a Gaussian distribution for the laser beam energy.

Review on Powder-Bed Laser Additive Manufacturing of Inconel 718 Parts

2015 ◽  
Author(s):  
Xiaoqing Wang ◽  
Xibing Gong ◽  
Kevin Chou
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Literature Review ◽  
Selective Laser Melting ◽  
Inconel 718 ◽  
Manufacturing Processes ◽  
Laser Melting ◽  
Laser Additive Manufacturing ◽  
Powder Bed ◽  
General Aspects

This study presents a thorough literature review on the powder-bed laser additive manufacturing processes such as selective laser melting (SLM) of Inconel 718 parts. The paper first introduces the general aspects of powder-bed laser additive manufacturing and then discusses the unique characteristics and advantages of SLM. Moreover, the bulk of this study includes extensive discussions of microstructures and mechanical properties, together with the application ranges, of Inconel 718 parts fabricated by SLM.

Linear-Shaped YAG Laser Beam with Uniform Power Density Distribution Applied to Machining of Ceramics

CIRP Annals ◽  
1994 ◽  
Vol 43 (1) ◽  
pp. 167-170 ◽  
Author(s):  
T. Miyazaki ◽  
Y. Tanaka ◽  
T. Tokunaga ◽  
N. Kinoshita
Keyword(s):  
Laser Beam ◽  
Density Distribution ◽  
Power Density ◽  
Yag Laser ◽  
Power Density Distribution ◽  
Machining Of Ceramics

A Method of Crack Control in Laser Cladding Process with Changing Power Density Distribution of Laser Beam

2011 ◽  
Vol 38 (1) ◽  
pp. 0103004 ◽  
Author(s):  
王东生 Wang Dongsheng ◽  
田宗军 Tian Zongjun ◽  
王泾文 Wang Jingwen ◽  
段宗银 Duan Zongyin ◽  
沈理达 Shen Lida ◽  
...  
Keyword(s):  
Laser Beam ◽  
Density Distribution ◽  
Power Density ◽  
Laser Cladding ◽  
Crack Control ◽  
Power Density Distribution ◽  
Laser Cladding Process

Review on powder-bed laser additive manufacturing of Inconel 718 parts

2016 ◽  
Vol 231 (11) ◽  
pp. 1890-1903 ◽  
Author(s):  
Xiaoqing Wang ◽  
Xibing Gong ◽  
Kevin Chou
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Literature Review ◽  
Selective Laser Melting ◽  
Inconel 718 ◽  
Manufacturing Processes ◽  
Laser Melting ◽  
Laser Additive Manufacturing ◽  
Powder Bed ◽  
General Aspects

This study presents a thorough literature review on the powder-bed laser additive manufacturing processes such as selective laser melting of Inconel 718 parts. This article first introduces the general aspects of powder-bed laser additive manufacturing and then discusses the unique characteristics and advantages of selective laser melting. The bulk of this study includes extensive discussions of microstructures and mechanical properties, together with the application ranges of Inconel 718 parts fabricated by selective laser melting.

Optimization and analysis of porosity and roughness in selective laser melting 316L parts

2018 ◽  
Vol 1 (90) ◽  
pp. 5-15 ◽  
Author(s):  
M. Król ◽  
J. Mazurkiewicz ◽  
S. Żołnierczyk
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Laser Beam ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
316L Stainless Steel ◽  
Selective Laser Sintering ◽  
Technological Parameters ◽  
Laser Melting ◽  
Research Issues

Purpose: The investigations have been carried out on 316L stainless steel parts fabricated by Selective Laser Melting (SLM) technique. The study aimed to determine the effect of SLM parameters on porosity, hardness, and structure of 316L stainless steel. Design/methodology/approach: The analyses were conducted on 316L stainless steel parts by using AM125 SLM machine by Renishaw. The effects of the different manufacturing process parameters as power output, laser distance between the point’s melted metal powder during additive manufacturing as well as the orientation of the model relative to the laser beam and substrate on porosity, hardness, microstructure and roughness were analysed and optimised. Findings: The surface quality parts using 316L steel with the assumed parameters of the experiment depends on the process parameters used during the SLM technique as well as the orientation of formed walls of the model relative to the substrate and thus the laser beam. The lowest roughness of 316L SLM parts oriented perpendicularly to the substrate was found when 100 W and 20 μm the distance point was utilised. The lowest roughness for part oriented at 60° relatives to the substrate was observed when 125 W and the point distance 50 μm was employed. Practical implications: Stainless steel is one of the most popular materials used for selective laser sintering (SLM) processing to produce nearly fully dense components from 3D CAD models. Reduction of porosity is one of the critical research issues within the additive manufacturing technique SLM, since one of the major cost factors is the post-processing. Originality/value: This manuscript can serve as an aid in understanding the importance of technological parameters on quality and porosity of manufactured AM parts made by SLM technique.

Vereinfachte Qualitätsbeurteilung in jeder Raumrichtung*/Simplified quality assessment in each direction Additive Manufacturing - Quality assurance of additive manufactured parts by test-artefacts

2016 ◽  
Vol 106 (11-12) ◽  
pp. 799-803
Author(s):  
M. Heinl ◽  
A. Loderer ◽  
B. Galovskyi ◽  
T. Prof. Hausotte
Keyword(s):  
Quality Assurance ◽  
Additive Manufacturing ◽  
Quality Assessment ◽  
Selective Laser Melting ◽  
Dimensional Accuracy ◽  
Process Quality ◽  
Fringe Projection ◽  
Optical Analysis ◽  
Laser Melting

Der Fachbeitrag beleuchtet die Entwicklung einer standardisierten Prüfkette mittels Test-Artefakten zur Post-Prozess-Qualitätsbeurteilung additiv gefertigter Bauteile. Das erlaubt eine Evaluierung der Maschinen- und Prozessfähigkeit des selektiven Laserstrahlschmelzens (SLM), wodurch prozessbedingte Limitierungen aufgezeigt und Fertigungsgenauigkeiten verbessert werden können. Die Charakterisierung einer geeigneten Artefakt-Referenzgeometrie sowie optische Analysen der Maßhaltigkeit mittels Streifenlichtprojektion stehen hierbei im Vordergrund.   This paper illustrates the development of a standardized approach by test-artefacts to analyze the process-quality assessment of additive manufactured workpieces. Thus an evaluation of the machine and process capability of the selective laser melting (SLM) is ensured to identify process-related limitations and to improve production accuracies. The characterization of a suitable artifact reference geometry, as well as optical analysis of the dimensional accuracy by fringe projection will be aspired.

scholarly journals COMPARISON BETWEEN LASER ADDITIVE MANUFACTURING AND LASER SPOT WELDING OF TITANIUM GRADE 2

2020 ◽  
Vol 6 (7) ◽  
pp. 119-122
Author(s):  
A. Barbangelo ◽  
L. C. Pedemonte
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Spot Welding ◽  
Low Cost ◽  
Laser Spot ◽  
Laser Melting ◽  
Laser Additive Manufacturing ◽  
Titanium Grade ◽  
Laser Spot Welding ◽  
Welding Technique

The microstructure and hardness of the melted area in a titanium grade 2 sample processed by Laser Spot Welding were compared to those processed by Selective Laser Melting. The results show that the materials obtained with the two processes have very similar characteristics. On the basis of what had been observed, it can be inferred that the Laser Spot Welding technique could be a low-cost way to verify the possibility of obtaining the desired properties with new alloys processed by Selective Laser Melting.

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