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<p>Dual-phase (DP) steels, characterized by a ferrite/martensite microstructure, have garnered significant industrial attention due to their superior mechanical properties. This study develops a crystal plasticity (CP) model for DP steels, incorporating ferrite grain boundaries (GBs) and ferrite/martensite phase boundaries (PBs). The GBs and PBs are characterized by introducing a relationship between plastic shear rate and slip resistance. Utilizing real microstructures of DP steels, the study investigates the influence of GBs and PBs on the work-hardening behavior of DP steel samples with varying compositions and heat treatment processes during loading. CP models for nanopolycrystalline DP steels with grain sizes of 80, 200, 300, and 500&#xa0;nm, as well as DP steels with PB percentages of 3.2%, 5.3%, 8.6%, and 14%, are established to systematically study the strengthening mechanisms of GBs and PBs. The results demonstrate that the consideration of GBs and PBs enhances the accuracy of the CP model in predicting stress–strain responses. Defects arising from the GBs and PBs improve the material’s resistance to deformation. High-stress fields tend to form at the intersection of homophase and heterophase boundaries due to microstructural differences. Under different grain size conditions, the strengthening effects of GBs and PBs exhibit a superposition effect, with the strengthening effect of GBs being more pronounced than that of PBs. Furthermore, during plastic deformation, PBs absorb more strain energy, modulating the macromechanical properties of DP steel by locally storing and subsequently releasing energy into phases with a higher elasticity modulus.</p>

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Modeling grain and phase boundary effects in crystal plasticity for dual-phase steels

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Siyu Han,
  • Yuqi Zhang,
  • Chenchong Wang,
  • Wei Xu,
  • Hongshuang Di

摘要

Dual-phase (DP) steels, characterized by a ferrite/martensite microstructure, have garnered significant industrial attention due to their superior mechanical properties. This study develops a crystal plasticity (CP) model for DP steels, incorporating ferrite grain boundaries (GBs) and ferrite/martensite phase boundaries (PBs). The GBs and PBs are characterized by introducing a relationship between plastic shear rate and slip resistance. Utilizing real microstructures of DP steels, the study investigates the influence of GBs and PBs on the work-hardening behavior of DP steel samples with varying compositions and heat treatment processes during loading. CP models for nanopolycrystalline DP steels with grain sizes of 80, 200, 300, and 500 nm, as well as DP steels with PB percentages of 3.2%, 5.3%, 8.6%, and 14%, are established to systematically study the strengthening mechanisms of GBs and PBs. The results demonstrate that the consideration of GBs and PBs enhances the accuracy of the CP model in predicting stress–strain responses. Defects arising from the GBs and PBs improve the material’s resistance to deformation. High-stress fields tend to form at the intersection of homophase and heterophase boundaries due to microstructural differences. Under different grain size conditions, the strengthening effects of GBs and PBs exhibit a superposition effect, with the strengthening effect of GBs being more pronounced than that of PBs. Furthermore, during plastic deformation, PBs absorb more strain energy, modulating the macromechanical properties of DP steel by locally storing and subsequently releasing energy into phases with a higher elasticity modulus.