Material Reuse in Laser Powder Bed Fusion: Side Effects of the Laser—Metal Powder Interaction
Abstract
:1. Introduction
2. The LPBF Process
2.1. Powder Feedstock Features
2.2. Heat Source
2.3. Shielding Gas Flow
3. Side Effects of Laser–Metal Powder Interaction
3.1. Denudation
3.2. Heat-Affected Powder
3.2.1. Spatter
- Spherical: spatter solidifies without colliding with other particles during flight.
- Aggregates: spatter collides with neighboring spatter in flight and/or after contacting with the powder bed.
- Coarse aggregates: multiple spatter particles collide with one another during flight and are completely subsumed.
3.2.2. Condensate
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Material | Reuse Times (Max) | Reuse Strategy | IED (Linear) (P/v) (J/m) | Tensile Properties (UTS) | Charpy | Fatigue Life | Reference |
---|---|---|---|---|---|---|---|
Ti-6Al-4V | 12 | Sieving | ND | Virgin: 1030 MPa Reused: up to 1101 MPa but plateau at 1072 from 6 to 12 reuses | ND | ND | [79] |
Ti-6Al-4V | 31 | Powder sampled from trap capsules (double cone shape); sieving | ND | Virgin: 984.3 ± 0.6 Reused: 1002.7 ± 1.2 (all samples subjected to hot isostatic pressing) | ND | ND | [85] |
Ti-6Al-4V | 15 | Sieving | 233.3 | Comparable | ND | No differences in as-built condition Longer life with the reused powder at a strain of 0.004 mm/mm with machined surface condition | [87] |
Ti-6Al-4V | ND | Sieving | ND | Comparable | Decrease with reuse | ND | [78] |
Ti-6Al-4V | 100 | Addition of virgin powder when needed | 233.3 | Scattered results but no decrease (stress relieved samples) | ND | ND | [30] |
IN718 | 14 | Sieving and drying | ND | ND | Variations with the number of reuses but no clear trend | ND | [19] |
IN718 | 10 | Sieving | ND | Consistent from build to build (samples were stress-relieved, hot isostatically pressed, solution-treated, and aged) | ND | Comparable low cycle fatigue | [8] |
AlSi10Mg | 1 | Sieving | 284.6 | Comparable | ND | ND | [83] |
AlSi10Mg | 1 | Sieving | 284.6 | Comparable | ND | ND | [88] |
AlSi10Mg | 8 | Sieving | ND | Decrease with reuse | ND | High cycle fatigue decreases with reuse | [81] |
AlSi10Mg | 18 | Sieving | 284.6 | No effects | ND | ND | [80] |
17-4 PH | 1 | Sieving | 237.5 | Similar trend for spatter-rich and non-spatter-rich samples. Abrupt failure for spatter-rich samples and 5% lower ductility | ND | ND | [89] |
17-4 PH | 10 | Sieving | 243.7 | Similar UTS but failure strain of print 10 parts decreased by ~7%. | ND | ND | [40] |
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Santecchia, E.; Spigarelli, S.; Cabibbo, M. Material Reuse in Laser Powder Bed Fusion: Side Effects of the Laser—Metal Powder Interaction. Metals 2020, 10, 341. https://doi.org/10.3390/met10030341
Santecchia E, Spigarelli S, Cabibbo M. Material Reuse in Laser Powder Bed Fusion: Side Effects of the Laser—Metal Powder Interaction. Metals. 2020; 10(3):341. https://doi.org/10.3390/met10030341
Chicago/Turabian StyleSantecchia, Eleonora, Stefano Spigarelli, and Marcello Cabibbo. 2020. "Material Reuse in Laser Powder Bed Fusion: Side Effects of the Laser—Metal Powder Interaction" Metals 10, no. 3: 341. https://doi.org/10.3390/met10030341