Characterization of the microstructure of a selective laser melting processed Al-50Si alloy: Effect of heat treatments

2017 ◽  
Vol 130 ◽  
pp. 243-249 ◽  
Author(s):  
Nan Kang ◽  
Pierre Coddet ◽  
Mohamed-Ramzi Ammar ◽  
Hanlin Liao ◽  
Christian Coddet
Keyword(s):  
Selective Laser Melting ◽  
Heat Treatments ◽  
Laser Melting ◽  
Alloy Effect

Influence of Heat Treatment on Microstructure and Mechanical Properties of Selective Laser Melted TiAl6V4 Alloy

2018 ◽  
Vol 284 ◽  
pp. 615-620 ◽  
Author(s):  
R.M. Baitimerov ◽  
P.A. Lykov ◽  
L.V. Radionova
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Selective Laser Melting ◽  
Room Temperature ◽  
Base Alloy ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Laser Melting ◽  
Microstructure And Mechanical Properties ◽  
Treatment Procedures

TiAl6V4 titanium base alloy is widely used in aerospace and medical industries. Specimens for tensile tests from TiAl6V4 with porosity less than 0.5% was fabricated by selective laser melting (SLM). Specimens were treated using two heat treatment procedures, third batch of specimens was tested in as-fabricated statement after machining. Tensile tests were carried out at room temperature. Microstructure and mechanical properties of SLM fabricated TiAl6V4 after different heat treatments were investigated.

Mechanical Behaviour of Gas Nitrided Ti6Al4V Bars Produced by Selective Laser Melting

2016 ◽  
Vol 704 ◽  
pp. 225-234 ◽  
Author(s):  
Peter Franz ◽  
Aamir Mukhtar ◽  
Warwick Downing ◽  
Graeme Smith ◽  
Ben Jackson
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Nitrided Layer ◽  
Xrd Analysis ◽  
Compound Layer ◽  
Processing Parameters ◽  
Heat Treatments ◽  
Laser Melting ◽  
Gas Nitriding ◽  
Heat Treated

Gas atomized Ti-6Al-4V (Ti64) alloy powder was used to prepare distinct designed geometries with different properties by selective laser melting (SLM). Several heat treatments were investigated to find suitable processing parameters to strengthen (specially to harden) these parts for different applications. The results showed significant differences between tabulated results for heat treated billet Ti64 and SLM produced Ti64 parts, while certain mechanical properties of SLM Ti64 parts could be improved by different heat treatments using different processing parameters. Most heat treatments performed followed the trends of a reduction in tensile strength while improving ductility compared with untreated SLM Ti64 parts.Gas nitriding [GN] (diffusion-based thermo-chemical treatment) has been combined with a selected heat treatment for interstitial hardening. Heat treatment was performed below β-transus temperature using minimum flow of nitrogen gas with a controlled low pressure. The surface of the SLM produced Ti64 parts after gas nitriding showed TiN and Ti2N phases (“compound layer”, XRD analysis) and α (N) – Ti diffusion zones as well as high values of micro-hardness as compared to untreated SLM produced Ti64 parts. The microhardness profiles on cross section of the gas nitrided SLM produced samples gave information about the i) microhardness behaviour of the material, and ii) thickness of the nitrided layer, which was investigated using energy dispersive spectroscopy (EDS) and x-ray elemental analysis. Tensile properties of the gas nitrided Ti64 bars produced by SLM under different conditions were also reported.

Characterization of laser spatter and condensate generated during the selective laser melting of 304L stainless steel powder

2020 ◽  
Vol 31 ◽  
pp. 100904 ◽  
Author(s):  
Austin T. Sutton ◽  
Caitlin S. Kriewall ◽  
Ming C. Leu ◽  
Joseph W. Newkirk ◽  
Ben Brown
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
304L Stainless Steel ◽  
Laser Melting

Selective laser melting of pure iron: Multiscale characterization of hierarchical microstructure

2019 ◽  
Vol 154 ◽  
pp. 222-232 ◽  
Author(s):  
P. Lejček ◽  
M. Roudnická ◽  
J. Čapek ◽  
D. Dvorský ◽  
J. Drahokoupil ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Pure Iron ◽  
Laser Melting ◽  
Hierarchical Microstructure

scholarly journals Aluminum–Alumina Composites: Part Ⅰ: Obtaining and Characterization of Powders

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3180 ◽  
Author(s):  
Gromov ◽  
Nalivaiko ◽  
Ambaryan ◽  
Vlaskin ◽  
Buryakovskaya ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Particle Morphology ◽  
Laser Diffraction ◽  
Alumina Content ◽  
Laser Melting ◽  
Aluminum Powders ◽  
Alumina Composites ◽  
Oxidation Modes ◽  
Volumetric Methods

The process of advanced aluminum-alumina powders production for selective laser melting was studied. The economically effective method of obtaining aluminum–alumina powdery composites for further selective laser melting was comprehensively studied. The aluminum powders with 10–20 wt. % alumina content were obtained by oxidation of aluminum in water. Aluminum oxidation was carried out at ≤200 °C. The oxidized powders were further dried at 120 °C and calcined at 600 °C. Four oxidation modes with different process temperatures (120–200 °C) and pressures (0.15–1.80 MPa) were investigated. Parameters of aluminum powders oxidation to obtain composites with 10.0, 14.5, 17.4, and 20.0 wt. % alumina have been determined. The alumina content, particle morphology, and particle size distribution for the obtained aluminum–alumina powdery composites were studied by XRD, SEM, laser diffraction, and volumetric methods. According to the obtained characteristics of aluminum–alumina powdery composites, they are suitable for the SLM process.

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