Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. Galvanized Q235 Microstructure
3.2. Microstructure of the Interfaces between AZ63 and Q235 Bimetallic Composites
3.3. Reaction Mechanism of AZ63 and Q235 Interfaces
3.4. Mechanical Properties
4. Conclusions
- The Q235 matrix of the AZ63/Q235, AZ63/galvanized Q235, and AZ63/galvanized Q235 + T6 treated samples formed a decarburized layer with a thickness of 300–350 μm near the interface. A small amount of intermetallic compounds was formed at the interface of AZ63/Q235, and a transition layer with an average thickness of about 15 μm was formed at the interface of AZ63/galvanized Q235. After T6 treatment, the average thickness of the interface transition layer between AZ63 and galvanized Q235 base layer was still about 15 μm, but the thickness of the transition layer became more uniform, and the size of the intermetallic compound was obviously refined.
- The Al Mn, and Fe elements were obviously aggregated at the interface of AZ63/galvanized Q235. However, the zinc on the surface of the galvanized Q235 melted into the AZ63 magnesium alloy during the casting. After T6 treatment, the Al, Mn, and Zn elements in the matrixes were uniformly distributed, but the Al element at the interface was obviously increased, while the Mn element was obviously decreased. The intermetallic compound at the interfaces of AZ63/galvanized Q235 was (Fe, Mn)2Al5 before and after T6 treatment.
- The shear strength of AZ63/Q235, AZ63/galvanized Q235, and AZ63/galvanized Q235 + T6 metallurgical bonding presents an increasing tendency. The hardness of the interface near the AZ63 matrix was significantly higher than that of the AZ63 matrix, and the interface of the AZ63/galvanized Q235 + T6 has the highest hardness, while the hardness of the AZ63/Q235 is the lowest.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Al | Zn | Ni | Cu | Mn | Si | Mg | C | S | P | Fe |
---|---|---|---|---|---|---|---|---|---|---|---|
AZ63 | 5.7 | 3.1 | 0.001 | 0.002 | 0.51 | 0.08 | Bal. | - | - | - | 0.004 |
Q235 | - | - | - | - | 0.5 | 0.3 | - | 0.12 | 0.04 | 0.0035 | Bal. |
A–B | Al–Fe | Al–Mg | Al–Mn | Al–Zn | Fe–Mn | Fe–Zn | Mg–Mn | Mg–Zn | Mn–Zn |
---|---|---|---|---|---|---|---|---|---|
(kJ/mol) | −11 | −2 | −10 | 1 | 0 | 4 | 10 | −4 | −6 |
Point | C | Fe | Al | Mn | Mg | Zn | Fe/Al |
---|---|---|---|---|---|---|---|
A | 4.417 | 20.374 | 48.802 | 16.821 | 9.439 | 0.146 | 0.41 |
B | 6.347 | 16.66 | 41.766 | 3.961 | 30.633 | 0.633 | 0.40 |
Sample | Average Shear Strength (MPa) |
---|---|
AZ63/Q235 | 8.2 ± 0.4 |
AZ63/galvanized Q235 | 21.3 ± 0.5 |
AZ63/galvanized Q235 + T6 | 31.9 ± 1.9 |
Point | Mg | Al | Zn | Mn |
---|---|---|---|---|
C | 94.2 | 4.9 | 0.7 | 0.2 |
D | 94.4 | 2.6 | 2.6 | 0.4 |
E | 96.2 | 2.6 | 1.1 | 0.1 |
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Dai, J.; Xie, H.; Zhou, Y.; Zou, Q.; Tian, Y.; Yang, Q.; Peng, C.; Jiang, B.; Zhang, J. Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting. Metals 2022, 12, 1233. https://doi.org/10.3390/met12071233
Dai J, Xie H, Zhou Y, Zou Q, Tian Y, Yang Q, Peng C, Jiang B, Zhang J. Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting. Metals. 2022; 12(7):1233. https://doi.org/10.3390/met12071233
Chicago/Turabian StyleDai, Jiahong, Hongmei Xie, Yangyang Zhou, Qin Zou, Yuan Tian, Qingshan Yang, Cheng Peng, Bin Jiang, and Jianyue Zhang. 2022. "Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting" Metals 12, no. 7: 1233. https://doi.org/10.3390/met12071233