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| Deformation Behavior of Constituent Phases and the Affected Factors in Dual-Phase Steel |
| WEI Xing1* FU Liming2 LIU Shichang3 WANG Wei4 SHAN Aidang2 |
1. Department of Mechanical and Electronic Engineering, Lu An Vocation Technology College, Luan, 237158
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240
3. Shenyang Research Institute of Foundry, Shenyang, 110022
4. Baosteel Research Institute, Shanghai, 201900 |
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Cite this article:
WEI Xing* FU Liming LIU Shichang WANG Wei SHAN Aidang. Deformation Behavior of Constituent Phases and the Affected Factors in Dual-Phase Steel. Chinese Journal of Materials Research, 2013, 27(6): 665-672.
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Abstract A physical model has been established to predict the stress-strain relations during the deformation of the two-phase materials, in which the effect of grain size and volume fraction of the phases on the change in strain and stress are completely considered. The predictions are good agreement with the experimental results. The micro-stress-strain partitioning between martensite (hard phase) and ferrite (soft phase) was quantitatively analyzed in the martensite-ferrite dual-phase steel. It is shown that the grain size and volume fraction greatly influence the stress-strain partitioning of the constituent phases. The stress ratio of the hard to soft phase decreases with the increase of the hard phase volume fraction. The strain ratio of the soft to hard phase increases before the plastic deformation of the hard phase starts when the relative macro-strains is applied. However with the macroscopic strain increasing, the hard phase begins to plastically deform and the strain ratio gradually reduces and eventually approaches to a constant. And the steel with relatively higher volume fraction of the hard phase has the relatively smaller constant value. In the case of a definite volume fraction, increasing the relative grain size of the hard phase contributes to the increase of the overall plasticity of the steel, while reducing the relative grain size of the hard phase helps to improve the overall strength of the steel. The optimal performance of the steel is achieved only when the grain size ratio of hard to soft phase is controlled within an appropriate range where each of constituent phases plays its most potential value.
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