Surface roughness improvement of the bent thin-walled copper tube by controlling the microstructure and texture components

摘要

Thin-walled copper tube is widely used in the heat-transfer fields, as a main component of various equipment, due to its highly efficient heat conductivity. However, the surface roughness problem (so-called orange peel) after bending deformation is raised as a limitation for its application. In this study, the relationship between microstructural parameters and the surface roughness was investigated by using electron back-scattered diffraction technique and surface mapping microscope test. The results show that, the surface roughness can be influenced both by grain size and texture components of the copper tube. The value of surface roughness is increased with the increasing of grain size at a certain scale. Meanwhile, improving the fraction of Goss texture component can reduce the degree of roughness, due to the Goss oriented-grains were prone to slip during bending deformation.