Densification Behavior, Microstructure Development, and Mechanical Performance of Laser-Based Powder Bed Fusion Processed Al2024 Alloy With Zr Additions

2021 ◽  
Author(s):  
Guichuan Li ◽  
Etienne Brodu ◽  
Jeroen Soete ◽  
Huiliang Wei ◽  
Tingting Liu ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Densification Behavior ◽  
Powder Bed Fusion ◽  
Microstructure Development ◽  
Powder Bed ◽  
Al2024 Alloy

scholarly journals Optimization of the Post-Process Heat Treatment of Inconel 718 Superalloy Fabricated by Laser Powder Bed Fusion Process

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 144
Author(s):  
Eslam M. Fayed ◽  
Mohammad Saadati ◽  
Davood Shahriari ◽  
Vladimir Brailovski ◽  
Mohammad Jahazi ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Mechanical Performance ◽  
Solution Treatment ◽  
Heat Treatments ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Homogenization Treatment ◽  
Powder Bed ◽  
Post Process ◽  
High Fraction

In the present study, multi-objective optimization is employed to develop the optimum heat treatments that can achieve both high-mechanical performance and non-distinctive crystallographic texture of 3D printed Inconel 718 (IN718) fabricated by laser powder bed fusion (LPBF). Heat treatments including homogenization at different soaking times (2, 2.5, 3, 3.5 and 4 h) at 1080 °C, followed by a 1 h solution treatment at 980 °C and the standard aging have been employed. 2.5 h is found to be the homogenization treatment threshold after which there is a depletion of hardening precipitate constituents (Nb and Ti) from the γ-matrix. However, a significant number of columnar grains with a high fraction (37.8%) of low-angle grain boundaries (LAGBs) have still been retained after the 2.5 h homogenization treatment. After a 4 h homogenization treatment, a fully recrystallized IN718 with a high fraction of annealing twins (87.1%) is obtained. 2.5 and 4 h homogenization treatments result in tensile properties exceeding those of the wrought IN718 at both RT and 650 °C. However, considering the texture requirements, it is found that the 4 h homogenization treatment offers the optimum treatment, which can be used to produce IN718 components offering a balanced combination of high mechanical properties and adequate microstructural isotropy.

scholarly journals Increasing the productivity of laser powder bed fusion: Influence of the hull-bulk strategy on part quality, microstructure and mechanical performance of Ti-6Al-4V

2020 ◽  
Vol 33 ◽  
pp. 101129 ◽  
Author(s):  
Charlotte de Formanoir ◽  
Umberto Paggi ◽  
Thomas Colebrants ◽  
Lore Thijs ◽  
Guichuan Li ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Part Quality

scholarly journals The role of side-branching in microstructure development in laser powder-bed fusion

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Minh-Son Pham ◽  
Bogdan Dovgyy ◽  
Paul A. Hooper ◽  
Christopher M. Gourlay ◽  
Alessandro Piglione
Keyword(s):  
Powder Bed Fusion ◽  
Microstructure Development ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1207 ◽  
Author(s):  
Placido Aliprandi ◽  
Fabio Giudice ◽  
Eugenio Guglielmino ◽  
Andrea Sili
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Mechanical Performance ◽  
Hot Isostatic Pressing ◽  
Processing Route ◽  
Powder Bed Fusion ◽  
Metal Powders ◽  
Surface Smoothing ◽  
Powder Bed ◽  
Ti Alloys

Thanks to their excellent mechanical strength in combination with low density, high melting point, and good resistance to corrosion, titanium alloys are very useful in many industrial and biomedical fields. The new additive manufacturing methods, such as Electron Beam Powder Bed Fusion based on the deposition of metal powders layers progressively molten by electron beam scanning, can overcome many of the machining problems concerning the production of peculiar shapes made of Ti alloys. However, the processing route is strictly determinant for mechanical performance of products, especially in the case of Ti alloys. In the present work flat specimens made of Ti-6Al-4V alloy produced by Electron Beam Powder Bed Fusion (or Electron Beam Melting) have been built and post-processed with the purpose of obtaining good tensile and creep performance. Preliminarily, the process parameters were set according to literature evidence and machine producer recommendations, validated by the results of a thermal analysis, aimed at satisfying the best processing conditions to reduce defects, as unmelted regions, microstructure coarsening or porosity, that are detrimental to mechanical behavior. Subsequently, Hot Isostatic Pressing and surface smoothing were considered, respectively, in order to reduce any internal porosity and lower roughness. Microstructure of the investigated specimens was characterized by optical and scanning electron microscopy observations and by X-ray diffraction measurements. Results show enhanced tensile behavior after the hot pressing treatment that allows to relieve stresses and reduce defects detrimental to mechanical properties. The best ductility was obtained by the combined effects of machining and densification. Creep test results verify the beneficial effects of surface smoothing.

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