Grain-scale micromechanics of polycrystal surfaces during plastic straining

Analysis Of Surface Orange Peel Of Automotive Aluminum Alloy Pipe Using Electron Backscatter Diffraction (EBSD)

“…The pronounced concave-convex uneven surface morphology is observed in the grain boundary map. In the concave areas (A area), a number of grains with low angle boundaries, but not individual out-of-plane displacements, were registered [5]. In addition, the morphology of orange peel resulting from anisotropy of tube hydroforming is inconsistent with the anisotropy of plastic strain inside grains.…”

“…At the same time, the surface defects appear during the fabrication of sheet and tube productions [3][4][5]. A common defect of roping or ridging has been extensively investigated by rolling and tensile deformation.…”

“…Previous work pointed out, that orange peel phenomena took place as the crystals underwent individual out-of-plane displacements at the surface. No clear relationship with the crystallographic orientation of the surface grains was established [5,7]. Nevertheless, Cao pointed out that the coarse grains with {100}<001> micotexture formed bulging and yielded orange peel defects of the steel sheet [8].…”

Production of Seamless Superconducting Radio Frequency Cavities from Ultra-fine Grained Niobium, Phase II Final Report

“…The connection between roughness with strain and grain size is well established [5,6]. Recent studies have examined the relationships between texture and roughening [7][8][9][10][11], and texture "clustering" and roughening [10]. Researchers at DESY evaluated tube made from plate to take advantage of the benefit of strain processing of the plate to break up the coarse grain billet [2].…”

Numerical analysis of strain-induced surface phenomena in aluminum alloys

“…Roughening is treated as a multiscale phenomenon evolving simultaneously at micro-, meso-and macroscales [3]. Our study is devoted to the mesoscale effects where the grain structure plays a key role.…”