Abstract
Several niobium plates were cold‐rolled at room temperature to a total reduction of 60% maintaining the geometry of the zone of deformation constant for each plate. Pole figures were obtained by means of the Schulz x‐ray reflection technique from various depths in the thickness direction for plates rolled with different ∆, the ratio of the mean height of the deformation zone to its contact length. Severe texture gradients were noted and characterized for Δ > 1; a modified texture different from the normal texture was observed at intermediate through‐the‐thickness locations. Both lateral widening and microhardness gradients were also in evidence for this case. No previously proposed theoretical explanation could account for these results.
Highlights
The cold-working of metals and alloys by rolling causes grain shape change and grain crystallographic reorientation to preferred orientations which can result%Research sponsored by the U.S Atomic Energy Commission under contract with the Union Carbide Corporation.R
In this latter regard experimental investigations such as those by Tarnovskii et a. have demonstrated, that under certain circumstances, the distortion of coordinate grids embedded within the zone of plastic deformation differed substantially from one layer to another in the through-the-thickness direction
The theoretical and experimental investigation of Dewhurst, Collins and Johnson 12 would suggest that the cause of this curvature may be related to small differences in either angular velocity or roll diameter or both, between the top and bottom rolls of the mill
Summary
The cold-working of metals and alloys by rolling causes grain shape change and grain crystallographic reorientation to preferred orientations which can result%Research sponsored by the U.S Atomic Energy Commission under contract with the Union Carbide Corporation.R. Attempts to theoretically understand and to predict texture development idealize the stress-state of the rolling process, assume plane-strain deformation and further consider that the plastic deformation of the work-piece occurs homogeneously, i.e. a transverse vertical section remains planar and vertical as it passes through the roll gap. In this latter regard experimental investigations such as those by Tarnovskii et a. Viewed with this perspective it might be considered that the occurrence of layer-to-layer variations in texture reported in a number of studies 2-6,9 is an indirect manifestation of accumulated inhomogeneous flow behavior during rolling
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