Microstructure Tailoring for High Strength Ti-6Al-4V without Alloying Elements through Optimized Preheating and Post-Heating Laser Scanning in Laser Powder Bed Fusion
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Fabrication
2.2. Experimental Methods
3. Results
3.1. Microstructure Defects and Grain Structure
3.2. Lattice Transformation, and Phase Decomposition in Preheated LPBF Ti-6Al-4V
3.2.1. Crystallography through XRD Analysis
3.2.2. Hexagonal Close-Packed (HCP) Lattice Modification
3.3. Mechanical Properties
4. Discussions
4.1. Material Modification via In-Situ Thermal Process toward a Defect-Free Microstructure
4.2. Modification of the α/α′ Lath Growth and The HCP Lattice Strain during β → α + β Decomposition
4.3. The Mechanical Response of the Tailored Microstructure
5. Conclusions
- Combining layer wise preheating and post-heating laser scanning during the LPBF process improved the relative density up to 99.99% and eliminated the process-induced defects of the Ti-6Al-4V material.
- In addition to defect improvement, the results showed that there is a noteworthy modification in the material’s microstructure i.e., thickness variation in α/α′ phases’ lath morphology, HCP lattice stretching, and the micro strain mode change with application of the combined layer wise preheating and post-heating laser scan.
- The results indicate a record level improvement in mechanical response of the material and 37% improvement was noticed among the different scanning strategies during the experimental study of the presented research.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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#. | Preheating Laser Power (W) | Preheating Laser Speed (mm/s) | E_Preheating (J/mm3) | Post Heating Laser Power (W) | Post Heating Laser Speed (mm/s) | E_Postheating (J/mm3) | E_Total (J/mm3) |
---|---|---|---|---|---|---|---|
1 | 196 | 1300 | 31.41 | 56 | 975 | 11.97 | 43.38 |
2 | 196 | 1300 | 31.41 | 56 | 1300 | 8.97 | 40.38 |
3 | 252 | 1625 | 32.31 | 56 | 975 | 11.97 | 44.27 |
4 | 252 | 1625 | 32.31 | 56 | 1300 | 8.97 | 41.28 |
5 | 196 | 1625 | 25.13 | 56 | 975 | 11.97 | 37.09 |
6 | 196 | 1625 | 25.13 | 98 | 1300 | 15.71 | 40.83 |
7 | 196 | 1625 | 25.13 | 56 | 650 | 17.95 | 43.08 |
8 | 224 | 1950 | 23.93 | 56 | 975 | 11.97 | 35.90 |
9 | 224 | 1950 | 23.93 | 98 | 975 | 20.94 | 44.87 |
10 | 224 | 1950 | 23.93 | 98 | 1300 | 15.71 | 39.64 |
11 | 224 | 1950 | 23.93 | 56 | 1300 | 8.97 | 32.91 |
12 | 224 | 1950 | 23.93 | 56 | 650 | 17.95 | 41.88 |
13 | 224 | 1625 | 28.72 | 56 | 975 | 11.97 | 40.68 |
14 | 224 | 1625 | 28.72 | 98 | 1300 | 15.71 | 44.42 |
15 | 224 | 1625 | 28.72 | 56 | 1300 | 8.97 | 37.69 |
16 | 224 | 1300 | 35.90 | 56 | 1300 | 8.97 | 44.87 |
17 | 252 | 1950 | 26.92 | 56 | 975 | 11.97 | 38.89 |
18 | 252 | 1950 | 26.92 | 98 | 1300 | 15.71 | 42.63 |
19 | 252 | 1950 | 26.92 | 56 | 650 | 17.95 | 44.87 |
20 | 252 | 1950 | 26.92 | 56 | 1300 | 8.97 | 35.90 |
21 | 224 | 1300 | 35.90 | 56 | 1300 | 8.97 | 44.87 |
22 | 196 | 1950 | 20.94 | 98 | 1300 | 15.71 | 36.65 |
23 | 196 | 1950 | 20.94 | 56 | 1300 | 8.97 | 29.91 |
24 | 196 | 1950 | 20.94 | 56 | 650 | 17.95 | 38.89 |
25 | 196 | 1950 | 20.94 | 56 | 975 | 11.97 | 32.91 |
26 | 224 | 1950 | 23.93 | 56 | 975 | 11.97 | 35.90 |
27 | 196 | 1950 | 20.94 | 98 | 975 | 20.94 | 41.88 |
# | Preheating Laser Power (W) | Preheating Laser Speed (mm/s) | Post-Heating Laser Power (W) | Post-Heating Laser Speed (mm/s) | AVE (%) | STD (%) |
---|---|---|---|---|---|---|
1 | 196 | 1300 | 56 | 975 | 0.06 | 0.04 |
2 | 196 | 1300 | 56 | 1300 | 0.07 | 0.07 |
3 | 252 | 1625 | 56 | 975 | 0.02 | 0.01 |
4 | 252 | 1625 | 56 | 1300 | 0.52 | 0.84 |
5 | 196 | 1625 | 56 | 975 | 0.10 | 0.07 |
6 | 196 | 1625 | 98 | 1300 | 0.14 | 0.12 |
7 | 196 | 1625 | 56 | 650 | 0.19 | 0.15 |
8 | 224 | 1950 | 56 | 975 | 0.38 | 0.27 |
9 | 224 | 1950 | 98 | 975 | 0.06 | 0.03 |
10 | 224 | 1950 | 98 | 1300 | 0.02 | 0.01 |
11 | 224 | 1950 | 56 | 1300 | 0.38 | 0.71 |
12 | 224 | 1950 | 56 | 650 | 0.10 | 0.07 |
13 | 224 | 1625 | 56 | 975 | 0.04 | 0.02 |
14 | 224 | 1625 | 98 | 1300 | 0.12 | 0.12 |
15 | 224 | 1625 | 56 | 1300 | 0.10 | 0.08 |
16 | 224 | 1300 | 56 | 1300 | 0.07 | 0.06 |
17 | 252 | 1950 | 56 | 975 | 0.06 | 0.02 |
18 | 252 | 1950 | 98 | 1300 | 0.14 | 0.25 |
19 | 252 | 1950 | 56 | 650 | 0.01 | 0.01 |
20 | 252 | 1950 | 56 | 1300 | 0.11 | 0.10 |
21 | 224 | 1300 | 56 | 1300 | 0.08 | 0.06 |
22 | 196 | 1950 | 98 | 1300 | 0.14 | 0.24 |
23 | 196 | 1950 | 56 | 1300 | 0.01 | 0.01 |
24 | 196 | 1950 | 56 | 650 | 0.07 | 0.05 |
25 | 196 | 1950 | 56 | 975 | 0.06 | 0.04 |
26 | 224 | 1950 | 56 | 975 | 0.03 | 0.03 |
27 | 196 | 1950 | 98 | 975 | 0.04 | 0.02 |
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Tanrikulu, A.A.; Ganesh-Ram, A.; Hekmatjou, H.; Durlov, S.H.; Salehin, M.N.; Amerinatanzi, A. Microstructure Tailoring for High Strength Ti-6Al-4V without Alloying Elements through Optimized Preheating and Post-Heating Laser Scanning in Laser Powder Bed Fusion. Metals 2024, 14, 629. https://doi.org/10.3390/met14060629
Tanrikulu AA, Ganesh-Ram A, Hekmatjou H, Durlov SH, Salehin MN, Amerinatanzi A. Microstructure Tailoring for High Strength Ti-6Al-4V without Alloying Elements through Optimized Preheating and Post-Heating Laser Scanning in Laser Powder Bed Fusion. Metals. 2024; 14(6):629. https://doi.org/10.3390/met14060629
Chicago/Turabian StyleTanrikulu, Ahmet Alptug, Aditya Ganesh-Ram, Hamidreza Hekmatjou, Sadman Hafiz Durlov, Md Najmus Salehin, and Amirhesam Amerinatanzi. 2024. "Microstructure Tailoring for High Strength Ti-6Al-4V without Alloying Elements through Optimized Preheating and Post-Heating Laser Scanning in Laser Powder Bed Fusion" Metals 14, no. 6: 629. https://doi.org/10.3390/met14060629