LXXI.Incidence of lattice distortion and orientation in cold-rolled metals

Abstract

The rate of production of lattice-distortion and preferred orientation during the cold-rolling of certain metals and alloys has been determined by X-ray methods. It was found : (1) That the degree of distortion plotted against the percentage reduction of thickness gives a definite type of curve, which is marked by an initial rapid rise of distortion to a constant value which further reduction maintains; this steady value is characteristic of the metal. (2) The preferred orientation does not occur gradually from commencement of working ; it appears after about 35 to 50 per cent, reduction, according to the metal, and then grows rapidly. (3) Lattice-distortion, when it occurs, reaches its maximum value before preferred orientation appears; it is shown that the latter cannot play a primary part in the changes of properties produced by cold-working.