Effects of the Build Direction on Mechanical Performance of Laser Powder Bed Fusion Additively Manufactured Ti6Al4V under Different Loadings

2021 ◽  
Author(s):  
Wenbo Sun ◽  
Yu E Ma ◽  
Weihong Zhang ◽  
Xudong Qian ◽  
Wei Huang ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

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 Mechanical and thermal performance of additively manufactured copper, silver and copper–silver alloys

2021 ◽  
pp. 146442072110409
Author(s):  
John Robinson ◽  
Arun Arjunan ◽  
Ahmad Baroutaji ◽  
Mark Stanford
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Thermal Performance ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Three Dimensional Printing ◽  
Industry Standard

On-demand additive manufacturing (three-dimensional printing) offers great potential for the development of functional materials for the next generation of energy-efficient devices. In particular, novel materials suitable for efficient dissipation of localised heat fluxes and non-uniform thermal loads with superior mechanical performance are critical for the accelerated development of future automotive, aerospace and renewable energy technologies. In this regard, this study reports the laser powder bed fusion processing of high purity (>99%) copper (Cu), silver (Ag) and novel copper–silver (CuAg) alloys ready for on-demand additive manufacturing. The processed materials were experimentally analysed for their relative density, mechanical and thermal performance using X-ray computed tomography, destructive tensile testing and laser flash apparatus, respectively. It was found that while Ag featured higher failure strains, Cu in comparison showed a 109%, 17% and 59% improvement in yield strength ([Formula: see text]), Young’s modulus ( E) and ultimate tensile strength, respectively. As such the [Formula: see text], E and ultimate tensile strength for laser powder bed fusion Cu is comparable to commercially available laser powder bed fusion Cu materials. CuAg alloys, however, significantly outperformed Ag, Cu and all commercial Cu materials when it came to mechanical performance offering significantly superior performance. The [Formula: see text], E and ultimate tensile strength for the novel CuAg composition were 105%, 33% and 94% higher in comparison to Cu. Although slightly different, the trend continued with a 106% and 91% rise for [Formula: see text] and ultimate tensile strength, respectively, for CuAg in comparison to industry-standard Cu. Unfortunately, E values for industry-standard Cu alloys were not available. When it came to thermal performance, laser powder bed fusion Ag was found to offer a 70% higher thermal diffusivity in comparison to Cu despite the variation in density and porosity. CuAg alloys however only showed a 0.8% variation in thermal performance despite a 10–30% increase in Ag. Overall, the study presents a new understanding regarding the three-dimensional printing and performance of Cu, Ag and CuAg alloys.

scholarly journals Beta Titanium Alloys Processed By Laser Powder Bed Fusion: A Review

2021 ◽  
Author(s):  
J. C. Colombo-Pulgarín ◽  
C. A. Biffi ◽  
M. Vedani ◽  
D. Celentano ◽  
A. Sánchez-Egea ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Functional Performance ◽  
Literature Analysis ◽  
Powder Bed Fusion ◽  
Medical Implants ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Beta Titanium ◽  
Structural Applications ◽  
Service Environments

AbstractIn βTi-alloys, some advances and developments have been reached toward optimizing their mechanical performance and their processability. However, the applications of these alloys via laser powder bed fusion (LPBF) are still under investigation. In this work, the processing of βTi-alloys via LPBF and their properties is reviewed with a focus on six selected metallurgical systems which are expected to be top performance materials in applications in the aeronautical and biomedical contexts. These six systems promise a better mechanical and functional performance considering different in-service environments for medical implants and structural applications. After literature analysis, the applicability of βTi-alloys to be processed via LPBF is then discussed considering the relevant fields of applications.

scholarly journals In-Situ Reduction of Mo-Based Composite Particles during Laser Powder Bed Fusion

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 702
Author(s):  
Suxia Guo ◽  
Weiwei Zhou ◽  
Zhenxing Zhou ◽  
Yuchi Fan ◽  
Wei Luo ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
High Strength ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Composite Powders ◽  
Powder Bed ◽  
Uniform Dispersion ◽  
The Matrix ◽  
Ultrahigh Temperature

Raw powders are processed in water during the freeze-dry pulsated orifice ejection method (FD-POEM), leading to the inclusion of oxygen impurities. This study proposes a strategy for removing the oxygen content and enhancing the mechanical performance of laser powder bed fusion (L-PBF) builds from powders using carbon nanotubes (CNTs) and H2 reduction. Spherical 1.5 wt.% CNT/Mo composite powders with uniform dispersion were fabricated via FD-POEM. The quantity of MoO2 decreased significantly, and a hexagonally structured Mo2C phase was simultaneously formed in the L-PBF build. The Mo2C with network structure was distributed along the boundaries of equiaxed Mo grains, leading to an increased Vickers hardness of the matrix. This study demonstrates the feasibility of fabricating oxygen-free and high-strength refractory parts during L-PBF for ultrahigh-temperature applications.

scholarly journals On the Relevance of Volumetric Energy Density in the Investigation of Inconel 718 Laser Powder Bed Fusion

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 538 ◽  
Author(s):  
Fabrizia Caiazzo ◽  
Vittorio Alfieri ◽  
Giuseppe Casalino
Keyword(s):  
Surface Roughness ◽  
Energy Density ◽  
Process Parameters ◽  
Vickers Hardness ◽  
Powder Bed Fusion ◽  
Processing Conditions ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Fractional Density ◽  
Experimental Variation

Laser powder bed fusion (LPBF) can fabricate products with tailored mechanical and surface properties. In fact, surface texture, roughness, pore size, the resulting fractional density, and microhardness highly depend on the processing conditions, which are very difficult to deal with. Therefore, this paper aims at investigating the relevance of the volumetric energy density (VED) that is a concise index of some governing factors with a potential operational use. This paper proves the fact that the observed experimental variation in the surface roughness, number and size of pores, the fractional density, and Vickers hardness can be explained in terms of VED that can help the investigator in dealing with several process parameters at once.

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