Strain-hardening behaviors of dual phase steels with microstructure features
| Autor: | Huang Tingting, Gou Ruibin, W. J. Dan, W.G. Zhang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Bainite Mean free path Mechanical Engineering Metallurgy 02 engineering and technology Strain hardening exponent 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Exponential function Mechanics of Materials Ferrite (iron) Martensite 0103 physical sciences Hardening (metallurgy) General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Materials Science and Engineering: A. 672:88-97 |
| ISSN: | 0921-5093 |
| Popis: | Due to the inhomogeneous deformation of the microstructure, it becomes difficult as well as necessary to determine the mechanical behavior of multi-phase high strength steels precisely. In this study, the strain distribution of microstructure is obtained utilizing Point Interpolation Method (PIM). The strain of microstructure with an exponential function of overall strain presents greater deformation in Ferrite than Martensite. Considering the characteristic deformation of individual phases, a dislocation based combined strain-hardening model is proposed to describe the overall stress-strain relationship of the material. The agreement between theoretical model and experiment results is verified by DP800. Based on the model, the stress-strain response of DP steels to different grain sizes and volume fractions of individual phases is studied. The strength and strain hardening behavior of DP steels with finer Ferrite, coarser Martensite and higher content of Martensite are significantly improved. In addition, dislocation mean free path, dislocation density, strain-hardening rate and hardening exponent of individual phases are calculated to describe the strain-hardening mechanism of individual phases and DP steels. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect