Abstract
The impact of asymmetric cold rolling was quantitatively assessed for an industrial aluminum alloy AA 5454. The asymmetric rolling resulted in lower rolling forces and higher strains compared to conventional symmetric rolling. In order to demonstrate the positive effect on the mechanical properties with asymmetric rolling, tensile tests, plastic-strain-ratio tests and hardness measurements were conducted. The improvements to the microstructure and the texture were observed with a light and scanning electron microscope; the latter making use of electron-backscatter diffraction. The result of the asymmetric rolling was a much lower planar anisotropy and a more homogeneous metal sheet with finer grains after annealing to the soft condition. The increased isotropy of the deformed and annealed aluminum sheet is a product of the texture heterogeneity and reduced volume fractions of separate texture components.
Highlights
Rolling is one of the most common metal-forming processes, frequently used for steels and aluminum alloys [1,2,3,4,5]
The asymmetric cold rolling of AA 5454 aluminum alloy plates was compared with symmetric rolling
The asymmetric rolling enables the creation of more shear texture components, in addition to the rolling and recrystallized texture components
Summary
Rolling is one of the most common metal-forming processes, frequently used for steels and aluminum alloys [1,2,3,4,5]. With their lower density and higher corrosion resistance, aluminum alloys will be used for increasing numbers of components in the automotive industry [6,7,8]. Geometry and friction are the major parameters that can be influenced to create the asymmetry This can involve rolling with different roller diameters, rolling with the uneven use of lubricants, rolling with single-drive roller and rolling with different rotation speeds of the rollers. Rolling with different rotation speeds, where the so-called “grabbing problems” are less significant than with a single-drive roller, have an impact on changes to the workpiece’s thickness as a consequence of the uneven distribution of the longitudinal velocity
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