Multiscale Comparison Study of Void Closure Law and Mechanism in the Bimetal Roll-Bonding Process
Abstract
:1. Introduction
2. Closure Process of Interface Voids
2.1. Experimental Methods
2.2. Closure Process
3. Multiscale Numerical Models
3.1. Finite Element Simulation at the Macro-scale
3.2. Molecular Dynamics Simulation at the Micro-scale
4. Closure Law and Mechanism of Interface Voids
4.1. Contact Deformation Law and Mechanism at the Macro-scale
4.2. Atomic Bonding Process at the Micro-scale
4.2.1. Closure Law of Interfacial Voids
4.2.2. Closure Mechanism of Interface Voids
5. Conclusions
- (1)
- At the macro-scale, the closure rate of voids decreases with the increase of the real contact area between interfaces. The shape of voids changes from rectangular to circular or elliptical, and finally disappears completely. At the micro-scale, the arrangement of atoms near the interface become disordered under a certain pressure and move towards the voids, finally becoming ordered again with the voids completely healed.
- (2)
- The deformation law of surface roughness peaks at the macro- and micro-scales is different. The interface morphology after roll-bonding at the macro-scale was determined by the morphology of 304 stainless steel with a larger yield strength ratio, while the interface morphology at the micro-scale was mainly determined by the morphology of Q235 carbon steel with a higher yield strength.
- (3)
- At the micro-scale, the surface roughness affects the mechanical behavior of the material during deformation. Disordered atoms due to surface roughness hinder dislocation propagation through the interface, making the rough surface more plastically deformable than the ideal plane.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Cr | Ni | C | Si | Mn | P | S | Fe |
---|---|---|---|---|---|---|---|---|
AISI304 | 18.97 | 8.86 | 0.04 | 1.00 | 2.00 | 0.035 | 0.03 | Bal |
Q235A | - | - | 0.22 | 0.30 | 0.43 | 0.04 | 0.05 | Bal |
Material | Young’s Modulus (E/MPa) | Poisson’s Ratio (γ) | ||
---|---|---|---|---|
AISI304 | 67 | 2.02 × 105 | 0.3 | 7.9 × 103 |
Q235A | 78 | 2.1 × 105 | 0.3 | 7.8 × 103 |
Group | Surface of AISI304 | Surface of Q235A | Strain |
---|---|---|---|
1 | Smooth | Rough | 0.5 |
2 | Smooth | Smooth | 0.5 |
3 | Rough | Smooth | 0.5 |
4 | Rough | Smooth | 0.1 |
5 | Rough | Smooth | 0.2 |
6 | Rough | Smooth | 0.3 |
7 | Rough | Smooth | 0.4 |
8 | Rough | Smooth | 0.6 |
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Zhang, Q.; Li, S.; Li, R.; Zhang, B. Multiscale Comparison Study of Void Closure Law and Mechanism in the Bimetal Roll-Bonding Process. Metals 2019, 9, 343. https://doi.org/10.3390/met9030343
Zhang Q, Li S, Li R, Zhang B. Multiscale Comparison Study of Void Closure Law and Mechanism in the Bimetal Roll-Bonding Process. Metals. 2019; 9(3):343. https://doi.org/10.3390/met9030343
Chicago/Turabian StyleZhang, Qingdong, Shuo Li, Rui Li, and Boyang Zhang. 2019. "Multiscale Comparison Study of Void Closure Law and Mechanism in the Bimetal Roll-Bonding Process" Metals 9, no. 3: 343. https://doi.org/10.3390/met9030343