Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process
Abstract
:1. Introduction
2. Motivation
3. Methods
Preliminary Assumptions for MC Simulations
4. Results
5. Discussion
6. Conclusions
- Increasing the gas pressure by one order of magnitude does not affect the process. It did not significantly reduce (less than 1%) the energy deposition efficiency.
- When increasing gas pressure, the heat shield temperature did not change substantially, meaning that it did not influence the thermal conductivity, despite the slight increase of gas presence in the chamber.
- Hence, the option of reducing volatility for elements such as chromium or aluminum is promising, especially since new pre-alloyed materials, such as stainless steel, are fresh candidates for EBM.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A
Appendix B
Beam Current [mA] | Beam Velocity [mm/s] | Focus Offset [mA] | Line Offset [mm] | Line Order | Hatch Direction | No. of Repetitions |
---|---|---|---|---|---|---|
33 | 42000 | 44 | 0.4 | 20 | unidirectional | 3 |
Mn [%] | Si [%] | Ni [%] | Cr [%] | Mo [%] | P [%] | |
---|---|---|---|---|---|---|
Powder | 1.67 | 0.72 | 12.34 | 18.28 | 2.68 | 0.024 |
As Build | 1.57 | 0.71 | 12.46 | 18.40 | 2.72 | 0.024 |
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Energy Deposition [%] | ||||||
---|---|---|---|---|---|---|
Region | Transport Change | Discarded Below Cutoff | Discarded Below AE or AP | Discarded Geometry end | XRF | Summary |
SS304L plate | 0.724 | 0 | 8.79 × 10−2 | 0 | 4.4 × 10−3 | 0.817 |
Out | 0 | 0 | 0 | 0.181 | 0 | 0.181 |
Sum | 0.724 | 0 | 8.79 × 10−2 | 0.181 | 4.4 × 10−3 | 0.998 |
Beam Current [mA] | Beam Velocity [mm/s] | Focus Offset [mA] | Line Offset [mm] | Line Order | Hatch Direction | Duration [min] |
---|---|---|---|---|---|---|
44 | 35,000 | 90 | 1.2 | 20 | unidirectional | 105 |
Region | Plate | Heat Shield |
---|---|---|
Temperature Difference—∆T [°C] | 15 | 3 |
Temperature Diversion [%] | 2.1 | 0.5 |
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Damri, E.; Tiferet, E.; Braun, D.; Ganor, Y.I.; Chonin, M.; Orion, I. Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process. Metals 2021, 11, 601. https://doi.org/10.3390/met11040601
Damri E, Tiferet E, Braun D, Ganor YI, Chonin M, Orion I. Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process. Metals. 2021; 11(4):601. https://doi.org/10.3390/met11040601
Chicago/Turabian StyleDamri, Elroei, Eitan Tiferet, Dor Braun, Yaron Itay Ganor, Michael Chonin, and Itzhak Orion. 2021. "Effects of Gas Pressure during Electron Beam Energy Deposition in the EBM Additive Manufacturing Process" Metals 11, no. 4: 601. https://doi.org/10.3390/met11040601