Journal
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
Volume 76, Issue 10, Pages 2783-2790Publisher
SPRINGER INDIA
DOI: 10.1007/s12666-023-02969-3
Keywords
UFG tube; Severe plastic deformation; PTCAP; Hydroforming process
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In this study, the formability of ultrafine grained (UFG) Cu-Zn tubes was investigated during the hydroforming process. Coarse-grained brass tubes were first processed to achieve significant grain refinement. Then, both coarse-grained and UFG tubes were processed in a square-sectional hydroforming die. The results showed that UFG tubes, due to their lower formability and higher strength, had a larger corner radius compared to the annealed tubes.
In the present study, formability of the ultrafine grained (UFG) Cu-Zn tubes were investigated during hydroforming process. The coarse-grained brass tubes were processed by the parallel tubular channel angular pressing (PTCAP) resulting in significant grain refinement. Then, coarse grained and UFG tubes were processed in a square-sectional hydroforming die. The results showed that the UFG tubes due to the lower formability and higher strength had a larger corner radius which was 6.35 mm while it was 1.9 mm for the annealed tube which is in good agreement with the tensile test data. Thickness distribution of the tubes were also examined through FEM simulation, and it was compared with the experimental data. SEM micrography was applied to evaluate fracture surface of the tubes after bursting.
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