Yin Bang Clad Material Co.

Wuxi, China

Yin Bang Clad Material Co.

Wuxi, China
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Gao C.,Yin Bang Clad Material Co. | Li L.,Yin Bang Clad Material Co. | Chen X.,Yin Bang Clad Material Co. | Zhou D.,Yin Bang Clad Material Co. | Tang C.,Guangdong University of Technology
Materials and Design | Year: 2016

The effect of surface preparation on the bond strength of Al-St clad strips in cold roll bonding (CRB) was investigated. For the purpose, the steel strip were prepared by two different way before the cold roll bonding, and evaluate the sample bonding strength by peeling test of the rolling deformation zone. The results show that, at the same reduction, bond strength of Al-St strip treated by belt grinding is higher than by wire brushing. The threshold reduction of Al-St strip treated by belt grinding (10%) is lower than by wire brushing (15%). The belt grinding treatment removes contamination such as oxide layer efficiently and has proper degree of surface hardened. The strip surface with thinner brittle layer and cleaner metal can create stronger bonding. A major feature of the bonding mechanism is that soft aluminum is extruded into the cracks on steel surface under normal roll pressure and contacts with underlying fresh steel metal so that the metallic bond between Al and Fe is formed. Meanwhile the mechanical biting from the blocks along the interface also contributes to the bonding strength. © 2016 Published by Elsevier Ltd.


Zhang Y.,Beijing University of Technology | Gao K.,Beijing University of Technology | Wen S.,Beijing University of Technology | Huang H.,Beijing University of Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

The aging strengthening behavior and coarsening process of Al3Er precipitates were investigated in Al-0.045Er (in at.%) alloys aged isothermally at 300-400 °C, using Vickers micro-hardness measurement and transmission electron microscopy (TEM) observation. The isothermal hardness curves showed that the peak hardness decreased slightly with the increase of temperature. From the TEM observations, the radius of Al3Er precipitates at peak hardness was measured to be 2.4 ± 0.4 nm. The coherency of Al 3Er precipitates started to get lost at the radius of 8.0-9.1 nm, which were much larger than the predicted value. The difference was speculated to be due the reduction of misfit between Al3Er precipitates and matrix when particles were very small. From the analysis of the coarsening of coherent Al3Er particles using LSW theory, the diffusion activation energy and the diffusivity pre-exponential constant of Er in Al were deduced to be 77.2 ± 5.3 kJ/mol and (4.3 ± 2.2) × 10-12 m2 s-1, respectively. Finally, the strength increment caused by Al3Er particles was evaluated using precipitation strengthening theory. It was found that when the particle radius was larger than 2.4 nm, the Orowan bypass mechanism dominated. In radius of 0-1.4 nm, a less coherency strengthening contribution indicated a reduction of lattice misfit between particles and matrix. From the strength plateaus in radius of 1.4-2.4 nm, the anti-phase boundary (APB) energy of Al3Er precipitates was deduced to be 0.60 ± 0.03 J/m2. © 2014 Elsevier B.V. All rights reserved.


Zhang Y.,Beijing University of Technology | Gao K.,Beijing University of Technology | Wen S.,Beijing University of Technology | Huang H.,Beijing University of Technology | And 4 more authors.
Journal of Alloys and Compounds | Year: 2014

The solubilities of Er and Yb in Al at high temperature were evaluated from the electrical resistivity measurement, from which the Delta;S and Delta;H were estimated to be 3.0 plusmn; 0.1k and -0.86 plusmn; 0.01 eV for Al-Er alloys, 3.7 plusmn; 1.0k and -0.93 plusmn; 0.07 eV for Al-Yb alloys, respectively. The solubility curves of Er and Yb therefore could be obtained. According to the solubility curves of Er and Yb, on the one hand, the largest volume fractions of Al3Er, Al3Yb at room temperature were calculated to be 0.18%, 0.10%, respectively, which were obviously less than that of Al 3Sc, i.e., 0.92%. On the other hand, the free energy per unit volume for the nucleation of trialuminides was evaluated with the consideration of Gibbs-Thomson effect. According to the obtained chemical driving force, the corresponding critical radius, critical nucleation energy and the steady state nucleation rate could be further calculated. The results indicated that in the binary alloys with the same concentration at the same temperature, comparing with Al3Sc, Al3Yb and Al3Er showed smaller critical radius and larger steady state nucleation rate, which implied that in Al-Yb and Al-Er alloys, higher number density of fine precipitates would be possibly existed. © 2014 Published by Elsevier B.V.


Zhou D.-J.,Yin Bang Clad Material Co. | Yin L.,Central South University | Zhang X.-M.,Central South University | Tang J.-G.,Central South University | Liu X.-X.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

The aluminum/stainless steel clad plates bonded by hot-rolling were annealed at different temperatures for different times. The microstructure, element distribution and identification of the intermetallic compound (IMC) at the interface were studied with Zeiss Ax10 optical microscope, Quanta-200 scanning electron microscope, EDAX energy dispersive spectrometer, D-max XRD, respectively. The influence of annealing temperature and time on the formation and growth of the IMC at the interface was investigated. The results show that the IMC (Fe 2Al 5) forms at the interface, which begins to form when the temperature is up to 773 K. With elongation of the annealing time, it becomes thicker according to the parabolic law. The growth activation energy for the growth of the compound is 162.3 kJ/mol, and the growth kinetics model is obtained, by which the thickness of the IMC can be evaluated.


Sun C.,Yin Bang Clad Material Co. | Zhang X.-J.,Yin Bang Clad Material Co. | Li L.,Yin Bang Clad Material Co. | Zhou D.-J.,Yin Bang Clad Material Co.
MATEC Web of Conferences | Year: 2016

The brazing behavior of 3003 fin assemble with 4343(filler layer)/4A60(transition layer)/08Al(steel layer) brazing sheet (the ratio of filler layer thickness to transition thickness were constant 1:2) were investigated. This study elucidates the brazing results vary with the layer thickness and brazing temperatures. Results showed that keeping the holding time at brazing temperature constant (the holding time of this study was 10 minutes in all brazing progress), under the condition of brazing temperature less than or equal to 580 °C, thinner filler layer led to well formed joint, while thicker filler layer led to defects at brazing joints because of poor mobility. When brazing temperature was up to 600 °C, a thinner transition layer trended to lead to the formation a thick intermetallic compounds layer on the Aluminum-Steel surface. It was inferred that Si diffused from molten filler metal to the interface of transition layer and steel layer and promoted the formation of intermetallic compounds. Furthermore, it was found that in the surface away from brazing joints, with lower Si content, the intermetallic compounds were mainly η (Fe2Al5), while higher Si content region nearby brazing joints trended to form τ5(Al8Fe2Si) and τ6(Al4.5FeSi). Meanwhile, a transition layer with thickness above 134μm could avoid the formation of intermetallic compound. The optimum brazing process was that temperature range was 590 °C to 595 °C with 10-minutes holding time and the transition layer thickness was suggested to be equal or more than 134μm. © The Authors, published by EDP Sciences, 2016.


Liu W.,Yin Bang Clad Material Co. | Yang Z.,Yin Bang Clad Material Co. | Li L.,Yin Bang Clad Material Co. | Zhou D.,Yin Bang Clad Material Co.
MATEC Web of Conferences | Year: 2016

The corrosion behavior of a multi-layer modified aluminum brazing sheet (AA4045/3003Mod./AA7072/AA4045) was investigated. The results shows that, the existence of BDP, which forms at the interface between clad and core layer during brazing, changes the corrosion form of the air side of the material from inter-granular corrosion to local exfoliation corrosion. The addition of anti-corrosion layer makes the corrosion form of the water side from inter-granular corrosion into uniform exfoliation corrosion. Compared to the normal triple-layer brazing sheet at the same thickness, the time to perforation of the modified four-layer brazing sheet is increased by more than 200%. © 2016 The Authors, published by EDP Sciences.


Zhou D.,Yin Bang Clad Material Co. | Chen Z.,Central South University | Zhang X.,Central South University | Tang J.,Central South University
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

The Al-Si alloy/low-carbon steel clad plates bonded by cold-rolling were annealed at different temperatures and time. Silicon's effect on the formation of the intermetallic compound (IMC) in the interface was investigated by use of optical microscope (OM), scanning electron microscope (SEM) and EDAX energy dispersive spectrometer. The results show that the clad plates with 0.67wt% of Si additions have the best effect for preventing the growth of the IMC layer, which has the highest IMC critical forming temperature of 615°C. But when Si additions is more than 1.62wt%, it decreases the melting point of Al-Si alloy, increases the element diffusion rate in Al-Si alloy, accelerate the IMC growth, and the structures of IMC are τ6-Al8Fe2Si + τ5-Al4.5FeSi + η-Al5Fe2.


Zeng X.-Y.,Yin Bang Clad Material Co Ltd | Li L.,Yin Bang Clad Material Co Ltd | Zhou D.-J.,Yin Bang Clad Material Co Ltd
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

4A60(Al)/08Al (steel) clad strips bonded by cold-rolling were annealed at different temperatures for different time. The effects of reduction, annealing temperature and annealing time on recrystallization behavior of Al/steel clad strips were studied. The results show that, with the increasing reductions, the grain size of the steel reduces when annealing at the same condition; the hardness values of the steel can keep in the same level (about 105 HV), despite of reduction, annealing temperature and annealing time after the steel grains recrystallize completely. As the reduction of the steel increases, recrystallization rate accelerates and its recrystallization activation energy decreases, when the reduction of the steel increases from 30% to 60%, the recrystallization activation energy of the steel can decrease by 110 kJ/mol. With hyperbolic fitting in mathematics, the relationship between recrystallization activation energy (Q) and true strain (e) of 08Al steel can be described well as: Q=36.6+64.4/e (kJ/mol, R2=0.985). ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Chen X.,Yin Bang Clad Material Co. | Li L.,Yin Bang Clad Material Co. | Zhou D.-J.,Yin Bang Clad Material Co.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

The growth characteristics of intermetallic compound (IMC) at the interface of Al(4A60)-steel(08Al) clad strip applied for air cooling at power station with different simulated brazing processes were investigated by metallographic microscopy, scanning electron microscopy, X-ray diffractometry. And the bonding properties of clad strip were studied through tensile peeling test. The results show that the critical forming temperature of IMC is 605-615 ℃ when the holding time is less than 20 min, and the composition of the IMC is Fe2Al5. As the holding time increases, the growth of IMC meets the parabolic relationship. The growth constant k is 0.69×10-12 m2/s while the annealing temperature is 615 ℃. When the IMC thickness is less than 12 µm, the interface bonding strength of clad strip still remains well (>45 MPa). As the thickness of IMC increases, the bonding strength of the interface decreases rapidly. When the thickness of IMC is 25-43 µm, the bonding strength of the interface decreases to 10-20 MPa. When the thickness of IMC is 54-68 µm, the bonding strength of the interface is only 5-10 MPa. ©, 2015, Central South University of Technology. All right reserved.


Zeng X.,Yin Bang Clad Material Co. | Li L.,Yin Bang Clad Material Co. | Zhou D.,Yin Bang Clad Material Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

The 4343 (Al)-4A60 (Al)-08Al (steel) tri-layer clad strips bonded by cold rolling were annealed at different temperature and time, the microstructure, element line scanning analysis and identification of the intermetallic compounds (IMC) at the interface were studied with metallograph microscopy, scanning electron microscope (SEM), energy dispersive spectrometer (EDAX) and X-ray diffraction (XRD), respectively. And the IMC's growth behavior at the Al-steel interface were investigated. The results show that higher content element Si in 4343 largely diffuses into 4A60 while the annealing at the higher temperature. The intermetallic compounds appear when annealed at 600℃ for 1 h. As the temperature and time increase, the layer number of IMC observed by SEM increases from 1 to 3, and it's composed of Fe4Al13 and Fe2Al5. The growth of IMC at Al-steel interface is controlled by diffusion, and its thickness increase complies with the parabolic law, the growth activation energy of the intermetallic compound is 14.4 kJ/mol. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

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