Development of microbands in mild steel during cross loading
- Inst. National Polytechnique de Grenoble, Saint Martin d'Heres (France). Genie Physique et Mecanique des Materiaux
Mild steel specimens are submitted to a complex strain path (tension-shear sequence). The stress decrease recorded at the beginning of the second path is associated at the grain scale with a localization of the deformation in microbands. These microbands are associated with a single crystallographic slip system and carry the main part of the imposed strain. The prediction of the active slip systems during both the prestrain and the second path with the Taylor and static models leads to a necessary condition for the development of microbands: the slip system having the maximum Schmid factor must have been latent during the prestrain. At high strain level, the material resumes strain hardening and the dislocation structure is then composed of sheets parallel and/or perpendicular to the shear direction. The origin of the flow localization and the transition between the two types of structures, i.e. microbands and dislocation sheets, are then discussed.
- OSTI ID:
- 7029520
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:6; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strain distribution in copper tensile specimens prestrained in rolling
The strain path dependence of plastic deformation response of AA5754: Experiment and modeling