Strain-Hardening Model of Dual-Phase Steel With Geometrically Necessary Dislocations
| Autor: | Chuang Ren, Yong Sheng Xu, Wen Jiao Dan, Wei Gang Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Dual-phase steel Mechanical Engineering 02 engineering and technology Work hardening Strain hardening exponent 021001 nanoscience & nanotechnology Condensed Matter Physics Strain gradient 01 natural sciences Grain size Stress (mechanics) Mechanics of Materials Geometrically necessary dislocations 0103 physical sciences General Materials Science Composite material Deformation (engineering) 0210 nano-technology |
| Zdroj: | Journal of Engineering Materials and Technology. 140 |
| ISSN: | 1528-8889 0094-4289 |
| DOI: | 10.1115/1.4039506 |
| Popis: | The strain-hardening behavior of metal during the uniaxial tension can be treated as the competing result of generation and annihilation of statistically stored dislocations (SSDs). Geometrically necessary dislocations (GNDs) are generated to accommodate a lattice mismatch and maintain deformation compatibility in dual-phase (DP) steels because of the heterogeneous deformation of the microstructure. In this study, a dislocation-based strain-hardening model that encompasses GNDs was developed to describe the mechanical properties of dual-phase steel. The GNDs were obtained based on a cell model of uniaxial deformation and the SSDs were calculated using a dynamic recovery model. The strain of each phase is a nonlinear function of the overall material strain obtained by the point-interpolation method (PIM). The proposed strain-hardening model was verified by using commercially produced DP600 steel. The calculated results obtained with GNDs are able to predict more precisely the experimental data than that without. The effects of martensite volume fraction and grain size on the strain-hardening behaviors of individual phases and material were studied. |
| Databáze: | OpenAIRE |
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