Effect of grooved roll profiles on microstructure evolutions of AZ31 sheets in Periodical Straining Rolling process

Microstructure Characterization and Mechanical Property of Mg/Al Laminated Composite Prepared by the Novel Approach: Corrugated + Flat Rolling (CFR)

“…The mean grain size of areas (a), (b), and (c) in position 1 is 3.02 μm, 3.27 μm, and 3.5 μm, respectively, which is smaller than that of areas (d), (e), and (f) in position 2 (3.3 μm, 6.0 μm, and 5.07 μm, respectively) ( Figure 10). As can be seen, position 2 (Figure 10d According to the original microstructure in Figure 2, the remarkable grain refinement can be mainly attributed to the significant effect of severe plastic deformation during the rolling process, corresponding with the research of Shimoyama [25]. Furthermore, note the smaller grain size of position 1 than position 2, and position 3 than position 4, indicating that the metal's flow lines appear Figures 10 and 11 show the optical microstructure of AZ31B and 5052 of the as-rolled flattened composite, respectively.…”

“…Therefore, small recrystallized grains and less coarsened grains can be seen in Figure 10b,c. On the contrary, position 2 mainly consists of numerous coarse grains and small grains in Figure 10e,f, which might be derived from macro shear banding during hot flat rolling [25]. As Haghdadi describes [45], under the external loading, the strain incompatibility develops in the interface of matrixes, and the high density of dislocations provides a strong driving force for grain refinement through severe plastic deformation.…”

“…Results reveal that the UTS of the composite is below 150 MPa with a rolling temperature of 400 • C. Furthermore, previous studies [17,21,22,24] mainly focus on the longitudinal tensile properties of Mg/Al laminated composite, and a few experiments have examined the transverse tensile properties. Shimoyama [25] analyzed the longitudinal and transverse tensile properties of AZ31 sheets prepared by periodical straining rolling. Results showed that the transverse tensile test piece exhibited larger elongation than the longitudinal samples.…”

Finite Element Modeling of Strain Distribution through Sheet Thickness during Cold Rolling with Grooved Rolls

“…Many processes for controlling plastic strain and microstructure have been proposed and their effectiveness has been discussed. Periodical straining rolling (PSR) process that employs the pinion-like or worm-gear-like grooved roll to introduce periodically localized plastic strain in rolled sheet have proposed in [6]. This process was developed to control strain distribution to generate microstructure and texture in rolled sheet.…”

“…This process was developed to control strain distribution to generate microstructure and texture in rolled sheet. It was experimentally proved [6] that the PSR process is able to weaken the basal texture and to improve the microstructure evolution of magnesium sheets. Investigation of the cold rolling of copper sheets having periodical artificial grooves running either in the rolling direction (longitudinal grooves) or in the width direction (transverse grooves) was reported in [7].…”