scholarly journals Tribocorrosion Behavior of Inconel 718 Fabricated by Laser Powder Bed Fusion-Based Additive Manufacturing

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 195
Author(s):  
Arpith Siddaiah ◽  
Ashish Kasar ◽  
Pankaj Kumar ◽  
Javed Akram ◽  
Manoranjan Misra ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Inconel 718 ◽  
Equilibrium Potential ◽  
Aqueous Environment ◽  
Powder Bed Fusion ◽  
Corrosive Environment ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Inconel Alloy ◽  
The Impact

Additive manufacturing (AM) by laser powder bed fusion (LPBF) has gained significant research attention to fabricate complex 3D Inconel alloy components for jet engines. The strategic advantages of LPBF-based AM to fabricate jet components for aerospace applications are well reported. The jet components are exposed to a high degree of vibration during the jet operation in a variable aqueous environment. The combined vibration and the aqueous environment create a tribological condition that can accelerate the failure mechanism. Therefore, it is critical to understand the tribocorrosion behavior of the Inconel alloy. In the present work, tribocorrosion behavior of the LPBF fabricated standalone coating of Inconel 718 in the 3.5% NaCl aqueous solution is presented. The LPBF fabricated samples are analyzed to determine the impact of porosity, generated as a result of LPBF, on the triobocorrosion behavior of AM Inconel 718. The study includes potentiodynamic tests, cathodic polarization, along with OCP measurements. The corrosive environment is found to increase the wear by 29.24% and 49.5% without the initiation of corrosion in the case of AM and wrought Inconel 718, respectively. A corrosion accelerated wear form of tribocorrosion is observed for Inconel 718. Additionally, the corrosive environment has a significant effect on wear even when the Inconel 718 surface is in equilibrium potential with the corrosive environment and no corrosion potential scan is applied. This study provides an insight into a critical aspect of the AM Inconel components.

scholarly journals Fluctuations of Tracks and Layers during Aluminium Laser Powder-Bed Fusion

2021 ◽  
Vol 11 (7) ◽  
pp. 3132
Author(s):  
Joerg Volpp ◽  
Filippo Belelli ◽  
Riccardo Casati
Keyword(s):  
Additive Manufacturing ◽  
Experimental Results ◽  
Complex Structures ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
High Loss ◽  
Material Volume ◽  
The Impact ◽  
Process Speed

Laser Powder-Bed Fusion (LPBF) is one method in Additive Manufacturing where layer-wise complex structures can be built. However, although the LPBF machines produce promising parts, the efficiency and process speed are typically still low, which can make the process expensive and uneconomical. Recent research showed that volume elements in the parts can be melted several times, while only a small material volume is added, which indicates a high loss of energy. In order to understand the process better, in this work, theoretical modeling and smart powder-bed experiments were designed to explain the impact on the track dimensions based on the previously built tracks and layers. It was found that the powder availability varies for each track and has an alternating character within and between layers. The comparison of the simulation and experimental results indicates that the powder pick-up from neighboring powder volumes is the main reason for the variations of the powder availability.

scholarly journals Effects on the distortion of Inconel 718 components along a hybrid laser-based additive manufacturing process chain using laser powder bed fusion and laser metal deposition

2021 ◽  
Author(s):  
Eckart Uhlmann ◽  
Jan Düchting ◽  
Torsten Petrat ◽  
Erwin Krohmer ◽  
Benjamin Graf ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Inconel 718 ◽  
Powder Bed Fusion ◽  
Laser Metal Deposition ◽  
Process Chain ◽  
Laser Powder Bed Fusion ◽  
Plate Material ◽  
Powder Bed ◽  
Manufacturing Process Chain

AbstractThe combination of laser powder bed fusion (LPBF), known for its geometrical freedom and accuracy, and the nozzle-based laser metal deposition process (LMD), known for its high build-up rates, has great potential to reduce the additive manufacturing times for large metallic parts. For the industrial application of the LPBF-LMD hybrid process chain, it is necessary to investigate the influence of the LMD process on the LPBF substrate. In addition, the build plate material also has a significant impact on the occurrence of distortion along the additive manufacturing process chain. In the literature, steel build plates are often used in laser-based additive manufacturing processes of Inconel 718, since a good metallurgical bonding can be assured whilst reducing costs in the production and restoration of the build plates. This paper examines the distortion caused by LMD material deposition and the influence of the build plate material along the hybrid additive manufacturing process chain. Twin cantilevers are manufactured by LPBF and an additional layer is subsequently deposited with LMD. The distortion is measured in the as-built condition as well as after heat treatment. The effect of different LMD hatch strategies on the distortion is determined. The experiments are conducted using the nickel-base alloy Inconel 718. The results show a significant influence of LMD path strategies on distortion, with shorter tool paths leading to less distortion. The remaining distortion after heat treatment is considerably dependent on the material of the build plate.

scholarly journals Geometric Feature Reproducibility for Laser Powder Bed Fusion (L-PBF) Additive Manufacturing with Inconel 718

2021 ◽  
pp. 102305
Author(s):  
Paul R. Gradl ◽  
Darren C. Tinker ◽  
John Ivester ◽  
Shawn W. Skinner ◽  
Thomas Teasley ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Inconel 718 ◽  
Geometric Feature ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed
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