Strategy Development for the Manufacturing of Multilayered Structures of Variable Thickness of Ni-Based Alloy 718 by Powder-Fed Directed Energy Deposition
Abstract
:1. Introduction
2. Materials and Methods
2.1. Background
- The development of a geometrical model for overlapped clads (see Section 2.1.1.).
- The development of an optimized deposition strategy for straight walls based on the geometrical model results (see Section 2.1.2.).
- The influence of the main process parameters and nozzle tilting angle on the deposition process and the geometrical model for overlapped cladding (see Section 2.1.3.).
2.1.1. Coatings: Overlapped Clad Geometrical Model
2.1.2. Deposition Strategy Optimization for Straight Walls
2.1.3. Influence of the Main Process Parameters and Tilting Angle
2.2. The Deposition of Multilayered Structures of Variable Thickness
- Selection of the optimum working conditions (P, v, ṁp) to manufacture the part.
- Definition of the deposition trajectory featuring a variable overlap percentage and clad numbers per layer, while taking into account the maximum horizontal displacement (ΔX) admissible, for adaptation to the profile of the wall, thus preventing material deposition outside of the geometric design.
- Adding “extra clads” on the edges of the layers to assure a homogeneous growth of the part.
2.2.1. Experimental Set Up
2.2.2. Strategy Development and Experimental Validation
3. Results and Discussion
4. Conclusions
- The proposed model and deposition strategy for multilayered walls of variable thickness deposited on horizontal substrate by using only the single clad characteristics as inputs, the overlap percentage and the tilting angle have been validated.
- In the proposed strategy, a different feed rate is needed for the extra clad, depending on the edge where it is deposited. Changing the overlap percentage per layer in the selected range adapted the deposited material to the geometry.
- Although the strategy was correct and it was possible to obtain acceptable accuracy in the deposited geometry, the waviness that was observed in the structure and the different heights that were obtained highlighted the need for an in-process control.
Author Contributions
Funding
Conflicts of Interest
Nomenclature
Symbol | Description | Unit |
a | Coefficient of the equation of the second-degree parabola | - |
A | Area | mm2 |
Ao | Overlapped area of clad i | mm2 |
AT | Layer area | mm2 |
A’ | Area of clad i + 1 | mm2 |
b | Coefficient of the equation of the second-degree parabola | - |
DED | Directed Energy Deposition | - |
do | Overlap percentage between adjacent clads | % |
Do | Distance between center lines of adjacent clads | mm |
h | Height | mm |
HL | Layer height | mm |
i | Number of the clad in the coating | - |
Lc | Length of the coating | mm |
MDR | Mass Deposition Rate | Kg·h−1 |
ṁp | Powder mass flow rate | g·min−1 |
NC | Number of clads per layer | - |
NL | Number of layers of the wall | - |
O | Origin | - |
p | Dilution depth | mm |
P | Laser power | W |
v | Feed rate | mm·min−1 |
w | Width | mm |
x | X axis | - |
y | Y axis | - |
Yi | Overlap point height | mm |
ΔX | Horizontal displacement | mm |
ΔZ | Vertical displacement | mm |
ηp | Efficiency of the injected powder | % |
θ | Wall angle | ° |
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Material | Ni | Cr | Fe | Nb + Ta | Mo | Ti | Al |
---|---|---|---|---|---|---|---|
Powder | 52.8 | 18.5 | 18 | 4.8 | 3.5 | 0.75 | 0.3 |
Substrate | 53.5 | 18.7 | 17.7 | 5 | 2.9 | 0.94 | 0.58 |
Layer | do (%) | Nc | HL |
---|---|---|---|
1 | 50 | 3 | 1.3 |
2 | 42.2 | 3 | 1.1 |
3 | 56.3 | 4 | 1.5 |
4 | 51 | 4 | 1.3 |
5 | 59.4 | 5 | 1.6 |
6 | 55.5 | 5 | 1.4 |
7 | 51.6 | 5 | 1.3 |
8 | 47.7 | 5 | 1.2 |
9 | 55 | 6 | 1.4 |
10 | 51.9 | 6 | 1.3 |
11 | 48.8 | 6 | 1.3 |
12 | 45.7 | 6 | 1.1 |
Average | 51.4 | 4.8 | 1.3 |
P (W) | v (mm·min−1) | ṁp (g·min−1) | do (%) | ΔZ (mm) | ΔX (mm) | θ (°) | ηp (%) |
---|---|---|---|---|---|---|---|
2500 | 500 | 18 | 40–60 | 1.3 | 0.58 | 66 | 60 |
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Ramiro, P.; Ortiz, M.; Alberdi, A.; Lamikiz, A. Strategy Development for the Manufacturing of Multilayered Structures of Variable Thickness of Ni-Based Alloy 718 by Powder-Fed Directed Energy Deposition. Metals 2020, 10, 1280. https://doi.org/10.3390/met10101280
Ramiro P, Ortiz M, Alberdi A, Lamikiz A. Strategy Development for the Manufacturing of Multilayered Structures of Variable Thickness of Ni-Based Alloy 718 by Powder-Fed Directed Energy Deposition. Metals. 2020; 10(10):1280. https://doi.org/10.3390/met10101280
Chicago/Turabian StyleRamiro, Pedro, Mikel Ortiz, Amaia Alberdi, and Aitzol Lamikiz. 2020. "Strategy Development for the Manufacturing of Multilayered Structures of Variable Thickness of Ni-Based Alloy 718 by Powder-Fed Directed Energy Deposition" Metals 10, no. 10: 1280. https://doi.org/10.3390/met10101280