Experimental study of the disturbed layer generation during hot rolling contact of aluminum with steel

The influence of work roll roughness on the surface/near-surface microstructure evolution of hot rolled aluminum–magnesium alloys

“…As stated earlier, it has previously been suggested by Riahi et al (2012) that shingles are formed from the local shear deformation of micro-wedges induced on the alloy surface when hot aluminum squeezes into grooves on the work roll surface. The formation of shingles via this mechanism corresponds to the results observed here.…”

“…Hot rolling tests were carried out using a rolling tribo-simulator with a roll-on-block configuration, with operational principles previously described by Riahi et al (2012) and displayed in Figure 1. The block, representing the aluminum slab, was fixed on a stage which allowed motion on both the X-and Y-axes.…”

“…Liu et al (2010) reported that the combination of high aspect ratios, high rolling speeds and worn (but still rough) roll surfaces induced high populations of shingles and thick near-surface deformed layers, whereas low shingle populations could be attained from freshly ground roll surfaces, low aspect ratios and low rolling speeds. Riahi et al (2012), proposed that shingle formation was due to the plastic deformation of micro-wedges formed by the grooves on the work roll surface. Riahi et al (2012) work also involved exploring the effect of forward slip on shingle occurrence, noting that an increase in forward slip resulted in higher frequency of shingle occurrence.…”

“…Riahi et al (2012), proposed that shingle formation was due to the plastic deformation of micro-wedges formed by the grooves on the work roll surface. Riahi et al (2012) work also involved exploring the effect of forward slip on shingle occurrence, noting that an increase in forward slip resulted in higher frequency of shingle occurrence. Preliminary studies by Gali et al (2015), who evaluated the effect of the work roll roughness, indicated that shingles were formed on rolled Al-Mg alloy samples when a WC-coated work roll with a surface roughness (Ra) exceeding 5µm was used, but none were observed with a polished work roll with a roughness of 0.01 µm.…”

The characterization of near‐surface defects evolved on aluminum–manganese alloys during hot rolling

“…The effect of high strains and shear deformation caused by sliding and grinding experienced during rolling has been identified to alter the near‐surface microstructure of aluminum alloys with the formation of a deformed near‐surface layer . This layer, also referred to as a tribolayer, disturbed layer, white layer and rolled‐in subsurface layer, influences the tribological and corrosion properties of aluminum alloys.…”