Biaxial deformation of 70-30 brass: flow behaviors, texture, microstructures
70-30 brass tubes have been tested in combinations of tension/internal pressure and in pure torsion. The flow properties, from these loading conditions, were measured from yield until local necking. It was found that the pure hoop tension, plane strain, and torsion flow curves were 15% lower than those in uniaxial tension and balanced biaxial tension when compared on the basis of a von Mises effective stress-strain criterion. Microstructures, at a von Mises strain of 0.4, were examined; no differences were observed between plane strain, torsion, and uniaxial tension deformation modes. Based on the microstructural measurements, the authors estimate that at most 13 pct of the deformation at an effective strain of 0.40 was by twinning. The initial texture and final textures, after balanced biaxial and uniaxial tension, were measured by pole figure analysis. The initial texture was qualitatively consistent with measured flow stress levels of the axisymmetric deformation modes (uniaxial tension, balanced biaxial tension, and hoop tension). A crystallographic effective stress-strain criterion was also applied to the torsion data. This method of analysis gave results which were better than the von Mises criterion.
- Research Organization:
- Los Alamos National Lab., NM
- OSTI ID:
- 5162941
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 15A; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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