X-ray residual stress measurements on cold-drawn steel wire

The interplanar spacing d{hkl} versus sin2 ψ distributions were measured for the 211, 310, 220 and 200 reflections from severely cold-drawn 0.7% C steel wire with a diameter of 0.25 mm. From the shape of the curves it was concluded that, as well as a 110 fibre texture and elastic anisotropy, plastic anisotropy of the ferrite crystals may be an important cause of the non-linearity in d{hkl} versus sin2 ψ. The shape of the curves, and therefore the residual state of stress of the wire, is influenced by the drawing parameters, i.e. the drawing die cone angle and the number of stages

Recrystallization at grain boundaries in deformed copper bicrystals

The role of specific grain boundaries in the nucleation of recrystallization textures is demonstrated by experiments on copper bicrystals. It is deduced that the major part of the recrystallized grains that have nucleated at the grain boundary can be traced back to having nucleated in {100} <001>, {210}<001> or {210}<120> orientations. These orientations do not exist in the bicrystals after deformation but can easily be accounted for by the <112>-slip nucleation mechanism proposed by Verbraak. X-ray strain measurements support this conclusion. Finally, on the basis of the observation of near-CSL misorientation relationships between deformed matrix and recrystallized grains, a suggestion is made for a more general nucleation mechanism

Martensitic aspects of the nucleation of the cube-texture in copper

Applied Science