Experimental Research on Variable Parameter Forming Process for Forming Specimen of TC4 Titanium Alloy by Selective Laser Melting
Abstract
:1. Introduction
2. Experimental Procedure
3. Results and Discussion
3.1. Density and Surface Roughness
3.1.1. Density Analysis
3.1.2. Surface Roughness Analysis
3.2. Mechanical Properties and Fracture Morphology Analysis
3.2.1. Mechanical Properties Analysis
3.2.2. Analysis of Fracture Morphology
3.3. Analysis of Microstructure
4. Conclusions
- 1.
- The density of the specimen formed by the VPFP was higher than that of the specimen formed by the QPFP. The more hierarchies of the VPFP there were, the higher the density of the specimens was. Additionally, the highest density was 99.7%. The surface roughness could be improved by using a VPFP.
- 2.
- The internal holes of the specimens formed by the VPFP were small in volume and occupied a relatively small proportion, which greatly reduced the phenomenon of stress concentration and improved the mechanical properties. The tensile strength of the specimen formed by a laser power of 300 W–260 W could reach 1185.214 MPa.
- 3.
- The content of the secondary martensite α’ phase decreased by the VPFP. With the superposition of hierarchy, the length of the primary α’ phase became shorter, the width increased, and the width of the columnar crystal β phase was smaller than that of the QPFP.
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Element | Ti | Al | V | Fe | C | N | H | O |
---|---|---|---|---|---|---|---|---|
Wt.% | Balance | 5.5~6.5 | 3.5~4.5 | 0.25 | 0.08 | 0.03 | 0.0125 | 0.13 |
No. | Number of Hierarchy | Layer Thickness (mm) | Aggregate Thickness (mm) | Laser Power per Hierarchy (W) | |||||
---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | ||||
1 | 1 | 0.9 | 0.9 | 350 | |||||
2 | 1 | 0.9 | 0.9 | 300 | |||||
3 | 1 | 0.9 | 0.9 | 290 | |||||
4 | 1 | 0.9 | 0.9 | 280 | |||||
5 | 1 | 0.9 | 0.9 | 270 | |||||
6 | 1 | 0.9 | 0.9 | 260 | |||||
7 | 1 | 0.9 | 0.9 | 250 | |||||
8 | 1 | 0.9 | 0.9 | 200 | |||||
9 | 6 | 0.15 | 0.9 | 300 | 290 | 280 | 270 | 260 | 250 |
10 | 3 | 0.3 | 0.9 | 300 | 275 | 250 | |||
11 | 2 | 0.45 | 0.9 | 300 | 250 | ||||
12 | 2 | 0.15 | 0.3 | 300 | 290 | ||||
13 | 3 | 0.15 | 0.45 | 300 | 290 | 280 | |||
14 | 4 | 0.15 | 0.6 | 300 | 290 | 280 | 270 | ||
15 | 5 | 0.15 | 0.75 | 300 | 290 | 280 | 270 | 260 | |
16 | 2 | 0.15 | 0.3 | 300 | 300 | ||||
17 | 3 | 0.15 | 0.45 | 300 | 300 | 300 | |||
18 | 4 | 0.15 | 0.6 | 300 | 300 | 300 | 300 | ||
19 | 5 | 0.15 | 0.75 | 300 | 300 | 300 | 300 | 300 | |
20 | 6 | 0.15 | 0.9 | 300 | 392 | 284 | 276 | 268 | 260 |
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Liu, Y.; Zhou, Y.; Shi, W.; Han, J.; Ye, D.; Han, Y. Experimental Research on Variable Parameter Forming Process for Forming Specimen of TC4 Titanium Alloy by Selective Laser Melting. Materials 2022, 15, 6408. https://doi.org/10.3390/ma15186408
Liu Y, Zhou Y, Shi W, Han J, Ye D, Han Y. Experimental Research on Variable Parameter Forming Process for Forming Specimen of TC4 Titanium Alloy by Selective Laser Melting. Materials. 2022; 15(18):6408. https://doi.org/10.3390/ma15186408
Chicago/Turabian StyleLiu, Yude, Yusheng Zhou, Wentian Shi, Jian Han, Donglei Ye, and Yufan Han. 2022. "Experimental Research on Variable Parameter Forming Process for Forming Specimen of TC4 Titanium Alloy by Selective Laser Melting" Materials 15, no. 18: 6408. https://doi.org/10.3390/ma15186408