Determination of optimal technological parameters of selective laser melting of AlSi10Mg aluminum alloy powder

2021 ◽  
Vol 10 ◽  
pp. 65-73
Author(s):  
A. V. Agapovichev ◽  
◽  
A. I. Khaimovich ◽  
V. V. Kokareva ◽  
V. G. Smelov ◽  
...  
Keyword(s):  
Alloy Powder ◽  
Relative Elongation ◽  
Scanning Speed ◽  
Point Of View ◽  
Technological Parameters ◽  
Granulometric Analysis ◽  
Distribution Ranges ◽  
Powder Particles ◽  
Aluminum Alloy Powder ◽  
Strength And Plasticity

Chemical and granulometric analysis of AlSi10Mg alloy powder was carried out. It was found that the powder particles are generally non-spherical, with a significant number of inclusions in the form of satellites. Particle size distribution ranges from 5 to 60 μm. The presence of conglomerates up to 70 μm in size is observed. The study of the influence of scanning parameters on the tensile strength and relative elongation of the samples has been carried out. It was found that in the range of the scanning speed range of 910 – 930 mm/s, local mechanical minima are observed. In order to optimize the scanning parameters, complex quality indicators are used. The greatest desirability from the point of view of obtaining the maximum strength and plasticity of the material is a combination of scanning parameters: laser power — 350 W, scanning step — 0.19 mm, scanning speed — 980 mm/s, with a layer thickness of 50 μm. The results of tests of cylindrical specimens made at angles of 0° and 90° relative to the construction platform are presented.

scholarly journals The Thermo-Mechanical Coupling Effect in Selective Laser Melting of Aluminum Alloy Powder

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1673
Author(s):  
Xianyin Duan ◽  
Xinyue Chen ◽  
Kunpeng Zhu ◽  
Tao Long ◽  
Shiyang Huang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Stress Distribution ◽  
Heat Source ◽  
Laser Power ◽  
Alloy Powder ◽  
Scanning Speed ◽  
Laser Melting ◽  
Spot Diameter ◽  
Melt Pool ◽  
Aluminum Alloy Powder

In the selective laser melting process, metal powder melted by the laser heat source generates large instantaneous energy, resulting in transient high temperature and complex stress distribution. Different temperature gradients and anisotropy finally determine the microstructure after melting and affect the build quality and mechanical properties as a result. It is important to monitor and investigate the temperature and stress distribution evolution. Due to the difficulties in online monitoring, finite element methods (FEM) are used to simulate and predict the building process in real time. In this paper, a thermo-mechanical coupled FEM model is developed to predict the thermal behaviors of the melt pool by using Gaussian moving heat source. The model could simulate the shapes of the melt pool, distributions of temperature and stress under different process parameters through FEM. The influences of scanning speed, laser power, and spot diameter on the distribution of the melt pool temperature and stress are investigated in the SLM process of Al6063, which is widely applied in aerospace, transportation, construction and other fields due to its good corrosion resistance, sufficient strength and excellent process performance. Based on transient analysis, the relationships are identified among these process parameters and the melt pool morphology, distribution of temperature and thermal stress. It is shown that the maximum temperature at the center point of the scanning tracks will gradually increase with the increment of laser power under the effect of thermal accumulation and heat conduction, as the preceded scanning will preheat the subsequent scanning tracks. It is recommended that the parameters with optimized laser power (P = 175–200 W), scanning speed (v = 200–300 mm/s) and spot diameter (D = 0.1–0.15 mm) of aluminum alloy powder can produce a high building quality of the SLM parts under the pre-set conditions.

scholarly journals Effect of Powder Size on Microstructure and Mechanical Properties of 2A12Al Compacts Fabricated by Hot Isostatic Pressing

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xina Huang ◽  
Lihui Lang ◽  
Gang Wang ◽  
Sergei Alexandrov
Keyword(s):  
Mechanical Properties ◽  
Alloy Powder ◽  
Powder Compact ◽  
Hot Isostatic Pressing ◽  
Powder Size ◽  
Microstructure And Mechanical Properties ◽  
Powder Particles ◽  
Aluminum Alloy Powder ◽  
Precipitated Phases ◽  
Dense Powder

This paper studied the effects of powder size on densification, microstructure, and mechanical properties of the hot isostatic-pressed 2A12 aluminum alloy powder compact. The results show that the near-fully dense powder compact can be successfully achieved and the smaller the powder is, the higher the relative density is. In addition, as the powder size decreases, the precipitated phases in the powder compact change from continuously point-like distribution at the junctions among powder particles to the concentrated distribution at the three-way intersections. Compared with the large powder, the tensile strength, yield strength, and elongation of the compact with the small powder were improved by 14%, 30.8%, and 48.6%, respectively.

Shock consolidation of Ni-Ti alloy powder

1986 ◽  
Vol 44 ◽  
pp. 430-431
Author(s):  
Naresh N. Thadhani ◽  
Thad Vreeland ◽  
Thomas J. Ahrens
Keyword(s):  
Alloy Powder ◽  
Amorphous Material ◽  
Ti Alloy ◽  
Two Phase ◽  
Near Surface ◽  
Optical Micrograph ◽  
Shock Compaction ◽  
Powder Particles ◽  
Ti Powder ◽  
Rapidly Solidified

A spherically-shaped, microcrystalline Ni-Ti alloy powder having fairly nonhomogeneous particle size distribution and chemical composition was consolidated with shock input energy of 316 kJ/kg. In the process of consolidation, shock energy is preferentially input at particle surfaces, resulting in melting of near-surface material and interparticle welding. The Ni-Ti powder particles were 2-60 μm in diameter (Fig. 1). About 30-40% of the powder particles were Ni-65wt% and balance were Ni-45wt%Ti (estimated by EMPA).Upon shock compaction, the two phase Ni-Ti powder particles were bonded together by the interparticle melt which rapidly solidified, usually to amorphous material. Fig. 2 is an optical micrograph (in plane of shock) of the consolidated Ni-Ti alloy powder, showing the particles with different etching contrast.

Effect of Composition on the Morphology and Hardness of Nanostructured Cu Based Composite and Alloy Powders/Granules Produced by High Energy Mechanical Milling

2007 ◽  
Vol 29-30 ◽  
pp. 143-146 ◽  
Author(s):  
Aamir Mukhtar ◽  
De Liang Zhang ◽  
C. Kong ◽  
P. R. Munroe
Keyword(s):  
Grain Size ◽  
Mechanical Milling ◽  
Alloy Powder ◽  
High Energy ◽  
Al2o3 Nanoparticles ◽  
X Ray ◽  
Fine Powders ◽  
Average Grain Size ◽  
Powder Particles

Cu-(2.5 or 5.0vol.%)Al2O3 nanocomposite balls and granules and Cu-(2.5vol.% or 5.0vol.%)Pb alloy powder were prepared by high energy mechanical milling (HEMM) of mixtures of Cu and either Al2O3 or Pb powders. It was observed that with the increase of the content of Al2O3 nanoparticles from 2.5vol.% to 5vol.% in the powder mixture, the product of HEMM changed from hollow balls into granules and the average grain size and microhardness changed from approximately 130nm and 185HV to 100nm and 224HV, respectively. On the other hand, HEMM of Cu–(2.5 or 5.0vol.%) Pb powder mixtures under the same milling conditions failed to consolidate the powder in-situ. Instead, it led to formation of nanostructured fine powders with an average grain size of less than 50nm. Energy dispersive X-ray mapping showed homogenous distribution of Pb in the powder particles in Cu–5vol.%Pb alloy powder produced after 12 hours of milling. With the increase of the Pb content from 2.5 to 5.0 vol.%, the average microhardness of the Cu-Pb alloy powder particles increases from 270 to 285 HV. The mechanisms of the effects are briefly discussed.

scholarly journals Influence of Technological Parameters on the Emision on DLP 3D Printing Process

2020 ◽  
Vol 70 (12) ◽  
pp. 4387-4392
Keyword(s):  
3D Printing ◽  
Point Of View ◽  
Particulate Emissions ◽  
Technological Parameters ◽  
Printing Process ◽  
Laboratory Activity ◽  
Emission Point ◽  
Measurement Methodology ◽  
Made In

The present work addresses the issue of emissions requires it made in resin polymerization processes at 3D digital light process (DLP) printing. From an emission point of view, both particulate and chemical emissions are analysed in the form of gases during the DLP printing process. In the paper, we present first the element, which are study. In second part of the paper, we presented the printer, material for printing, measuring apparatus for emission and measurement methodology. In the three part of paper, we made the determinations for gas emissions. Will follow the determinations for particulate emissions. In the final chapter, the data generated by the printing emissions related to the problems specific to the laboratory activity and it has made the specific conclusion in rapport with the printing process. Keywords: 3D printing; emission particles; air pollution, resin material, DLP printing

scholarly journals Influence of Technological Parameters on the Dimension of GEAR Parts Generated with PLA Matherial by FDM 3D Printing

2018 ◽  
Vol 55 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Mircea Dorin Vasilescu ◽  
Traian Fleser
Keyword(s):  
Computer Simulation ◽  
3D Printing ◽  
Gear Tooth ◽  
Energy Resource ◽  
Electric Machines ◽  
Resource Consumption ◽  
Point Of View ◽  
Technological Parameters ◽  
Functional Characteristics

The purpose of this research is to establish the technology of 3D printable production on the principle of FDM of gears made of PLA, ABS and PETG mainly. In the paper we present first the dimensional generation and specific aspects that need to be considered to produce gears with internal or external teeth of the cylindrical type with vertical or inclined teeth. Generating the gears appeared as a necessity for the reconditioning of the components of the processing machines and of the electric machines made both in the process of elaboration of the bachelor�s and the laboratory works, with reduced energy resource consumption and low pollution as low as possible. After the construction, we past to identify the dimension that have implications for both mechanical and kinematic resistance to achieve a product with good cinematic and functional characteristics. After that are made an analysis of the layers generated, both from the computer simulation and from the point of view of the analysis of layers physically generated on a gear tooth with external teeth.

FORMATION OF SILICON CARBIDE COATINGS BY CHEMICAL VAPOR DEPOSITION (review). Part 1

2021 ◽  
pp. 100-111
Author(s):  
D.V. Sidorov ◽  
◽  
A.A. Schavnev ◽  
A.A. Melentev ◽  
◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Point Of View ◽  
Technological Parameters ◽  
Technical Literature ◽  
Pure Silicon ◽  
Carbide Coatings ◽  
Complex Process

The article provides an overview of the scientific and technical literature in the field of the formation of silicon carbide coatings by chemical vapor deposition (CVD). CVD is a complex process, approaches to which vary depending on the tasks being solved. Depending on the technological parameters, the initial reagents, the substrate for deposition, the type and design of the CVD reactors, it is possible to achieve both the deposition of pure silicon carbide and the co-deposition of silicon and/or carbon. In the first part of the article, attention is paid to the study of CVD from the point of view of the mechanisms of chemical reactions, the design of the deposition apparatus, the substrates for deposition.

Experimental Study of Forming Rene95 Alloy Parts by Laser Cladding

2001 ◽  
Author(s):  
Qilin Deng ◽  
Dejin Hu ◽  
Jingyu Pei ◽  
Wenwu Zhang ◽  
Y. Lawrence Yao
Keyword(s):  
Experimental Study ◽  
Laser Cladding ◽  
Laser Power ◽  
Alloy Powder ◽  
High Strength ◽  
Scanning Speed ◽  
Main Process ◽  
Beam Diameter ◽  
Laser Beam Diameter ◽  
Metal Parts

Abstract In this paper, experimental study of forming metal parts by laser cladding Rene95 alloy powder was reported. The influence of main process parameters, such as laser power, scanning speed and laser beam diameter, on the thickness, width and the angle of the laser cladding track was investigated. The microstructures of laser cladding parts were studied and compared with those of common casting parts. The obtained Rene95 metal parts formed by laser cladding are dense and of high strength.

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