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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Residual stresses in the strips from copper-based alloys

Staszewski M., Rdzawski Z. M., Wrona A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 25, nr 2

35-38

Purpose: The aim of this work was to define the stress state in the strips from copper-based alloys with an account of the parameters of rolling and flattening. Design/methodology/approach: Samples of thin strips from three commercial copper-based alloys, i.e. CuSn6, CuZn33 and CuNi18Zn27, and from copper 99.98% in purity, were examined. The stress analysis was performed using X-ray diffraction method. The macro-stresses were determined by the measurements of the changes in a lattice constant and by the "square sin psi" technique. The micro-stresses were measured by the diffraction line broadening method. Findings: It was found that the residual stresses, measured at both surfaces of the cold rolled strip, depend strongly on the rolling conditions and on rolling gap geometry. Considerable differences between these surfaces have been observed before and after the flattening process. However, they can be significantly reduced by suitably conducted flattening process. Research limitations/implications: Further studies are necessary to assess the possibility of reducing stresses on both surfaces of a strip in the case of non-ideal shape of rolls in a rolling mill. Practical implications: Modification of technological flowchart for rolling strips from hardly-deformable copper-based alloys enables obtaining the required dead flatness of the strips. Originality/value: The results from this work can be used to improve the technology of rolling and flattening thin strips from copper and copper-based alloys.