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Study on Microstructural Evolution of DP Steel Considering the Interface Layer Based on Multi Mechanism Strain
Qianduo Zhuang1, Zhenming Yue1, Lingxiao Zhou1
1School of Mechanical, Electrical and Information Engineering, Shandong University at Weihai, Weihai 264209, China.
Materials (Basel, Switzerland)
|July 9, 2022
Summary
A new model explains how interface layer hardening affects dual-phase (DP) steel
Area of Science:
- Materials Science
- Mechanical Engineering
- Computational Modeling
Background:
- Dual-phase (DP) steel exhibits complex mechanical behavior due to its heterogeneous microstructure.
- Understanding local hardening effects at interfaces is crucial for predicting overall material properties.
Purpose of the Study:
- To develop a multi-mechanism constitutive model for DP steel.
- To investigate the influence of interface layer hardening on mechanical heterogeneity.
- To analyze the role of geometrically necessary dislocations (GNDs) and back stress.
Main Methods:
- Constitutive equations were established at both grain and sample levels.
- Finite element simulations were employed to model DP steel behavior.
- The ferrite phase was simulated as an inhomogeneous matrix with martensite islands.
Main Results:
- Interface layer thickness significantly impacts macroscopic hardening, while layer number has minimal effect.
- GNDs and back stress at the grain level show little influence on strengthening.
- GNDs at the sample level contribute approximately 47% to the flow stress.
Conclusions:
- The proposed model accurately captures the effect of local hardening on DP steel's mechanical heterogeneity.
- Interface layer thickness is a key microstructural parameter for controlling DP steel properties.
- Sample-level GNDs play a substantial role in the strengthening mechanism of DP steel.
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