On the Effect of Deposition Patterns on the Residual Stress, Roughness and Microstructure of AISI 316L Samples Produced by Directed Energy Deposition

2019 ◽  
pp. 206-212 ◽  
Author(s):  
Gabriele Piscopo ◽  
Alessandro Salmi ◽  
Eleonora Atzeni ◽  
Luca Iuliano ◽  
Mattia Busatto ◽  
...  
Keyword(s):  
Residual Stress ◽  
Energy Deposition ◽  
Aisi 316L ◽  
Deposition Patterns ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Modeling of the Effect of the Building Strategy on the Thermomechanical Response of Ti-6Al-4V Rectangular Parts Manufactured by Laser Directed Energy Deposition

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1643
Author(s):  
Xufei Lu ◽  
Miguel Cervera ◽  
Michele Chiumenti ◽  
Junjie Li ◽  
Xianglin Ji ◽  
...  
Keyword(s):  
Residual Stress ◽  
Energy Deposition ◽  
Heat Transfer Process ◽  
Thermally Induced ◽  
Directed Energy Deposition ◽  
Building Process ◽  
Geometric Precision ◽  
In Situ Experiments ◽  
Stress And Deformation ◽  
Directed Energy

Part warpage and residual stress are two of the main challenges for metal additive manufacturing (AM) as they result in lower geometric precision and poor mechanical properties of the products. This work investigates the effect of the building strategy on the heat transfer process and the evolution of the thermally induced mechanical variables in laser directed energy deposition (L-DED) in order to minimize residual stresses and deformations. A 3D finite element (FE) thermo-mechanical model is firstly calibrated through in-situ experiments of rectangular workpieces fabricated by L-DED technology, and, secondly, the coupled thermo-mechanical responses for different process parameters and scanning patterns are discussed in detail. On the calibration stage, the remarkable agreement is achieved between predicted results and experimental data. Regarding the modeling stage, the numerical results indicate that minimization of the part warpage is achieved by reducing the back speed and shortening the scanning lines during the building process. Both residual stress and deformation can be further reduced if preheating the baseplate is added before L-DED.

scholarly journals Directed Energy Deposition of AISI 316L Stainless Steel Powder: Effect of Process Parameters

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 932
Author(s):  
Alberta Aversa ◽  
Giulio Marchese ◽  
Emilio Bassini
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Energy Deposition ◽  
316L Stainless Steel ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Building Parameters

During Laser Powder-Directed Energy Deposition (LP-DED), many complex phenomena occur. These phenomena, which are strictly related to the conditions used during the building process, can affect the quality of the parts in terms of microstructural features and mechanical behavior. This paper investigates the effect of building parameters on the microstructure and the tensile properties of AISI 316L stainless-steel samples produced via LP-DED. Firstly, the building parameters were selected starting from single scan tracks by studying their morphology and geometrical features. Next, 316L LP-DED bulk samples built with two sets of parameters were characterized in terms of porosity, geometrical accuracy, microstructure, and mechanical properties. The tensile tests data were analyzed using the Voce model and a correlation between the tensile properties and the dislocation free path was found. Overall, the data indicate that porosity should not be considered the unique indicator of the quality of an LP-DED part and that a mechanical characterization should also be performed.

scholarly journals Non-dimensional process maps for residual stress in laser directed energy deposition

2020 ◽  
Vol 48 ◽  
pp. 697-705
Author(s):  
Chaitanya Vundru ◽  
Ramesh Singh ◽  
Wenyi Yan ◽  
Shyamprasad Karagadde
Keyword(s):  
Residual Stress ◽  
Energy Deposition ◽  
Process Maps ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Residual stress and distortion of rectangular and S-shaped Ti-6Al-4V parts by Directed Energy Deposition: Modelling and experimental calibration

2019 ◽  
Vol 26 ◽  
pp. 166-179 ◽  
Author(s):  
Xufei Lu ◽  
Xin Lin ◽  
Michele Chiumenti ◽  
Miguel Cervera ◽  
Yunlong Hu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Energy Deposition ◽  
Experimental Calibration ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Microstructure and Mechanical Properties of AISI 316L Produced by Directed Energy Deposition-Based Additive Manufacturing: A Review

2020 ◽  
Vol 10 (9) ◽  
pp. 3310 ◽  
Author(s):  
Abdollah Saboori ◽  
Alberta Aversa ◽  
Giulio Marchese ◽  
Sara Biamino ◽  
Mariangela Lombardi ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Mechanical Characteristics ◽  
Mechanical Performance ◽  
Functionally Graded ◽  
Published Data ◽  
Aisi 316L ◽  
Building Conditions ◽  
Directed Energy Deposition ◽  
Directed Energy

Directed energy deposition (DED) as a metal additive manufacturing technology can be used to produce or repair complex shape parts in a layer-wise process using powder or wire. Thanks to its advantages in the fabrication of net-shape and functionally graded components, DED could attract significant interest in the production of high-value parts for different engineering applications. Nevertheless, the industrialization of this technology remains challenging, mainly because of the lack of knowledge regarding the microstructure and mechanical characteristics of as-built parts, as well as the trustworthiness/durability of engineering parts produced by the DED process. Hence, this paper reviews the published data about the microstructure and mechanical performance of DED AISI 316L stainless steel. The data show that building conditions play key roles in the determination of the microstructure and mechanical characteristics of the final components produced via DED. Moreover, this review article sheds light on the major advancements and challenges in the production of AISI 316L parts by the DED process. In addition, it is found that in spite of different investigations carried out on the optimization of process parameters, further research efforts into the production of AISI 316L components via DED technology is required.

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