Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process
Abstract
:1. Introduction
2. Materials and Methods
2.1. Selected Materials
2.2. UVAW Process
2.3. Joint Characterization
3. Results and Discussion
3.1. Weld Cross-Sections
3.2. Weld Microstructure
3.3. Weld Microhardness
3.4. Tensile Strength and Fracture Characteristic
4. Conclusions
- The application of ultrasonic vibration improved the wetting of welds and eliminated porosity defects.
- The mechanical stirring effect caused by ultrasonic vibration made the interfacial reaction layer of the brazing zone change from wavy to laminar.
- Ultrasound-induced acoustic streaming and cavitation significantly refined the microstructure of the weld zone, and its average grain size was about 39 ± 1.7 µm.
- With ultrasonic power of 0.9 kW and a current of 65 A, the maximum tensile strength of the ultrasound-treated galvanized steel/Mg alloy joint was 251 ± 4.1 MPa, which was a 14.6% increase from the joint without ultrasonic treatment.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Mn | Si | C | Zn | Al | Fe | Mg |
---|---|---|---|---|---|---|---|
Steel | 0.65 | 0.25 | 0.08 | - | - | Bal. | - |
AZ31 | 0.41 | 0.05 | - | 0.88 | 2.90 | - | Bal. |
Filler | 0.32 | - | - | 0.79 | 2.80 | - | Bal. |
Parameters | Value |
---|---|
Voltage | 14 V |
Wire feed speed | 0.5 m/min |
Welding speed | 0.2 m/min |
Welding current | 55–75 A |
Ultrasonic power | 0–1.5 kW |
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Yang, F.; Liu, B. Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process. Materials 2021, 14, 1674. https://doi.org/10.3390/ma14071674
Yang F, Liu B. Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process. Materials. 2021; 14(7):1674. https://doi.org/10.3390/ma14071674
Chicago/Turabian StyleYang, Fangzhou, and Bing Liu. 2021. "Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process" Materials 14, no. 7: 1674. https://doi.org/10.3390/ma14071674