Effect of Alternating Bending on Structure, Texture, and Mechanical Properties of Cu-Zn Alloy

摘要

The structure, texture, and mechanical properties of a C27400 brass (63 Cu-37 Zn) after alternating elastic-plastic deformation were studied. A 3-mm thick brass strip after softening annealing was subjected to alternating bending through one pass (19 bending acts) using an ARKU 25/21 precision roller straightener. Electron microscopy, x-ray texture analysis, microhardness measurements, and tensile testing were used to characterize the material. It has been established that the alternating bending leads to an increase in the yield point of a thick strip by 62 and the ultimate tensile strength by 12, while the relative elongation is slightly reduced from 57 to 52. Such a set of properties is provided by the grain structure refinement through the twinning mechanism; after alternating bending, the average grain size decreases more than 2 times. The contribution of different layers of the strip to the overall hardening is estimated. The anisotropy of the mechanical properties and its relation to texture was studied.