Enhanced Strength–Ductility Combination in Laser Welding of CrCoNi Medium-Entropy Alloy with Ultrasonic Assistance
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Welding Process
2.3. Characterization of the Mechanical Properties and Microstructure
3. Results and Discussion
3.1. Microstructure
3.1.1. Macroscopic View of the Joint
3.1.2. Dendrites
3.1.3. Grain Morphology
3.1.4. Chemical Elements
3.2. Mechanical Properties
3.2.1. Microhardness
3.2.2. Tensile Testing
3.3. Deformation Mechanisms
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Process Number | Welding Method | Power (kW) | Welding Speed (mm/s) | Laser Inclination Angle (°) | Gas Flow (L·min−1) | Shielding Gas |
---|---|---|---|---|---|---|
Process 1 | Laser welding | 1.8 | 10 | 10 | 30 | Ar2 |
Process 2 | Laser welding | 1.8 | 10 | 10 | 30 | N2 |
Process 3 | Ultrasonic (40 W) + Laser welding | 1.8 | 10 | 10 | 30 | N2 |
Process 4 | Ultrasonic (80 W) + Laser welding | 1.8 | 10 | 10 | 30 | N2 |
Material | Yield Strength (MPa) | Tensile Strength (MPa) | Uniform Elongation (%) | |||
---|---|---|---|---|---|---|
300 K | 77 K | 300 K | 77 K | 300 K | 77 K | |
Joint (Ar) | 405.6 ± 9 | / | 662 ± 2 | / | 19.6 | / |
Joint (N2) | 413.7 ± 10 | / | 678.9 ± 8 | / | 22.7 | / |
Joint (ultrasonic + N2) | 421 ± 6 | 681.17 ± 14 | 686 ± 10 | 1071 ± 19 | 26.8 | 28 ± 1 |
Base material | 527 ± 9 | 856.2 ± 33 | 886 ± 19 | 1313 ± 28 | 56.4 ± 3 | 69 ± 1 |
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Zhou, H.; Yan, S.; Zhu, Z. Enhanced Strength–Ductility Combination in Laser Welding of CrCoNi Medium-Entropy Alloy with Ultrasonic Assistance. Metals 2024, 14, 971. https://doi.org/10.3390/met14090971
Zhou H, Yan S, Zhu Z. Enhanced Strength–Ductility Combination in Laser Welding of CrCoNi Medium-Entropy Alloy with Ultrasonic Assistance. Metals. 2024; 14(9):971. https://doi.org/10.3390/met14090971
Chicago/Turabian StyleZhou, Hongmei, Shaohua Yan, and Zhongyin Zhu. 2024. "Enhanced Strength–Ductility Combination in Laser Welding of CrCoNi Medium-Entropy Alloy with Ultrasonic Assistance" Metals 14, no. 9: 971. https://doi.org/10.3390/met14090971