Performance Comparison of Zn-Based and Al–Si Based Coating on Boron Steel in Hot Stamping
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Samples and Devices
2.3. Experimental Schemes
3. Results and Discussion
3.1. The Anti-Oxidation Properties of Coatings
3.2. The Forming Performance of Different Coatings
3.3. The Quenching Performance of Different Coatings
3.4. Summary and Outlook
4. Conclusions
- (1)
- When hearted at 930 °C for 3~4 min, GA, GI and Al–Si coatings will present as different colors because of the different consistency of oxides at the coating surface. There is no bare area of the substrate, showing that all the GA, GI and Al–Si coatings could provide the antioxidant protection of the substrate.
- (2)
- The heated GA, GI and Al–Si coatings could all act as the lubricant in hot stamping to avoid friction damage between sheet substrate and die surface. Unlike Al–Si coatings, there are many micro cracks in worn GA and GI coatings, resulting in the macro scratches in the worn region of GA and GI coated samples.
- (3)
- When the under similar deformation, more and larger cracks will occur in the GI coating at the round corners than in GA and Al–Si coatings, and will even damage the substrate because of LMIE phenomenon. The Al–Si coating can provide the best substrate protection because of the ductile layer between Al–Si coating and substrate.
- (4)
- There is no significant difference between the temperature variation curves of GA, GI and Al–Si coated samples in quenching. The thermal conductivity of the GI coating is slightly better than the Al–Si and GA coatings.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Element | C | Si | Mn | P | S | B | Cr | Ni | Al | Fe |
---|---|---|---|---|---|---|---|---|---|---|
Percentage (wt.%) | 0.23 | 0.25 | 1.35 | 0.02 | 0.002 | 0.0026 | 0.17 | 0.016 | 0.046 | Bal. |
Coatings | Size (mm × mm) | Thickness (mm) | Coating Thickness (μm) | Heating Temperature (°C) | Holding Time (min) |
---|---|---|---|---|---|
Al–Si | 290 × 200 | 1.4 | ≈25 | 930 | 4 |
GA | ≈13 | 3 | |||
GI | ≈13 | 3 |
Coatings | Holding Pressure (ton) | Quenching Start Temperature (°C) | Quenching End Temperature (°C) | Quenching Time (s) | Average Quenching Speed (°C/s) |
---|---|---|---|---|---|
GA | 100 | 730 | 200 | 6.2 | 85.48 |
GI | 801 | 5.3 | 113.4 | ||
Al–Si | 723 | 5.46 | 95.79 |
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Chen, L.; Chen, W.; Cao, M.; Li, X. Performance Comparison of Zn-Based and Al–Si Based Coating on Boron Steel in Hot Stamping. Materials 2021, 14, 7043. https://doi.org/10.3390/ma14227043
Chen L, Chen W, Cao M, Li X. Performance Comparison of Zn-Based and Al–Si Based Coating on Boron Steel in Hot Stamping. Materials. 2021; 14(22):7043. https://doi.org/10.3390/ma14227043
Chicago/Turabian StyleChen, Long, Wei Chen, Miao Cao, and Xin Li. 2021. "Performance Comparison of Zn-Based and Al–Si Based Coating on Boron Steel in Hot Stamping" Materials 14, no. 22: 7043. https://doi.org/10.3390/ma14227043