4.7 Article

Micromechanism involved in ultrafine grained ferrite/martensite dual phase steels strengthened by nanoscale Cu-rich precipitates

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Investigation on micromechanism involved in ferrite hardening after prestraining of dual-phase steel

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Summary: The evolution of low angle grain boundaries and Taylor factor in dual-phase steel during prestraining was investigated, showing a transition from plastic deformation dominated by soft ferrite phases to interface deformation. The hardening of ferrite was attributed to the formation of stable dislocation subgrain structures, leading to reduced strain hardening ability, increased yield strength, and decreased uniform elongation. The stress drop observed after strain hardening completion initiated plastic deformation directly at the interface, resulting in a mixed mode of failure involving both cleavage brittle and dimple ductile fracture. This study provides insights and experimental evidence for ferrite hardening behavior after prestraining in dual-phase steel.

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