Estimation Method of Interpass Time for the Control of Temperature during a Directed Energy Deposition Process of a Ti–6Al–4V Planar Layer
Abstract
:1. Introduction
2. Analysis of Wire Feeding-Type DED Process
2.1. Wire Feeding-Type DED Process
2.2. Finite Element Models
2.2.1. Overlapping Bead Profile for Planar Layer Deposition
2.2.2. Heat Source Model
2.2.3. Material Properties and Boundary Conditions
3. Proposed Estimation of Proper Interpass Time Using Regression Analysis
4. Results and Discussion
4.1. Temperature Distributions
4.1.1. Interpass Temperature Using Selected Proper Interpass Time Scheme
4.1.2. Depth of Melt Pool and Heat-Affected Zone
4.2. Thermo-Mechanical Characteristics during Planar Layer Deposition
4.2.1. Vertical Displacement
4.2.2. Induced Residual Stress
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Abbreviations
DED | Directed Energy Deposition |
LENS | Laser Engineered Net Shaping |
FE | Finite Element |
FEA | Finite Element Analysis |
HAZ | Heat Affected Zone |
CITS | Constant Interpass Time Scheme |
PITS | Proper Interpass Time Scheme |
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Power of Laser (P, kW) | Travel Speed (v, mm/s) | Cross-Section Area of Polygonal-Shaped Profile (Ap, mm2) | Height of Bead (hb, mm) | Center Distance between Beads (gb, mm) | Center Distance-to-Width Ratio (gw) |
---|---|---|---|---|---|
1.5 | 8 | 3.720 | 1.6 | 2.325 | 0.684 |
Power of Laser (P, kW) | Efficiency of Laser (η, %) | Penetration Depth (dp, mm) | Effective Beam Radius at Surface of Bead (re, mm) | Effective Beam Radius at dp (ri, mm) |
---|---|---|---|---|
1.5 | 60 | 0.2 | 0.750 | 0.375 |
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Chua, B.-L.; Ahn, D.-G. Estimation Method of Interpass Time for the Control of Temperature during a Directed Energy Deposition Process of a Ti–6Al–4V Planar Layer. Materials 2020, 13, 4935. https://doi.org/10.3390/ma13214935
Chua B-L, Ahn D-G. Estimation Method of Interpass Time for the Control of Temperature during a Directed Energy Deposition Process of a Ti–6Al–4V Planar Layer. Materials. 2020; 13(21):4935. https://doi.org/10.3390/ma13214935
Chicago/Turabian StyleChua, Bih-Lii, and Dong-Gyu Ahn. 2020. "Estimation Method of Interpass Time for the Control of Temperature during a Directed Energy Deposition Process of a Ti–6Al–4V Planar Layer" Materials 13, no. 21: 4935. https://doi.org/10.3390/ma13214935