Profile Change Law of Clad Rebars and the Formation Mechanism of Composite Interfaces during Hot Rolling

Abstract

Rough- and intermediate-rolled composite billets and finished clad rebars were cut using flying shears. The law of metal rheology and the mechanism of composite interface generation during clad rebar formation were then investigated using metallographic microscopy, electron backscatter diffraction, and scanning electron microscopy. The radial deformation trend of the clad rebars was greater than that of HRB400 rebars and “ears” were more likely to appear during the rolling process. The widths of the decarburization and composite zones and diffusion distances of each element decreased as the cumulative reduction rate increased. Furthermore, as deformation increased, the number of oxides on the composite interface significantly decreased, the proportion of recrystallized grains increased, and the grains became more refined. These changes led to increases in the bond and tensile strengths of the composite interface. According to the research above, the pass filling degree should be within 0.85–0.9 and the cumulative reduction rate should be over 80% when rolling clad rebars.

Welding-induced corrosion and protective measures for clad rebars in neutral chloride environments

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Figure 2 Rolling process of clad steel.

Figure 3 Schematic diagram of the relative position of the rolling mills and the spray point 19 .

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Interface Microstructure and Properties of Vacuum-Hot-Rolled 55#/316L Clad Rebars

“…The reduction rate for the 55#/316L rebar was as high as 83%. During large deformations, the oxide on composite interfaces is continuously crushed and fully dissolved into the base and coating [ 27 ].…”

Material Properties and Structure of Al-Mg-Si Alloy Thin-Walled Profiles with Different Alloy Compositions and Aging Processes

“…In addition, material ductility is inversely proportional to grain size, where the smaller the grain size, the more ductile the material [30,31]. Therefore, the 6xxx-1(1.6Mg/Si) and 6xxx-3(1.14Mg/Si) profiles showed good crushing properties with only minor crack formations on the surface during compressive deformation, while the 6xxx-2(1.33Mg/Si) profile has a large grain size and poorer ductility, and hence it is more susceptible to cracking during the deformation process.…”

“…Therefore, the 6xxx-1(1.6Mg/Si) and 6xxx-3(1.14Mg/Si) profiles showed good crushing properties with only minor crack formations on the surface during compressive deformation, while the 6xxx-2(1.33Mg/Si) profile has a large grain size and poorer ductility, and hence it is more susceptible to cracking during the deformation process. In addition, material ductility is inversely proportional to grain size, where the smaller the grain size, the more ductile the material [30,31]. Therefore, the 6xxx-1(1.6Mg/Si) and 6xxx-3(1.14Mg/Si) profiles showed good crushing properties with only minor crack formations on the surface during compressive deformation, while the 6xxx-2(1.33Mg/Si) profile has a large grain size and poorer ductility, and hence it is more susceptible to cracking during the deformation process.…”