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<p>This study investigates the impact of high-temperature annealing and subsequent asymmetric rolling (ASR) on the mechanical properties of AISI430 ferritic stainless steel. A bimodal microstructure with martensite islands was created via heat treatment and quenching, followed by 60% asymmetric cold rolling. Results show a progressive grain size reduction with increase in rolling strain. At 60% strain, deformation bands formed in coarse grains, while fine grains displayed curvature due to hard martensite islands. Dislocation density and rolling texture also increased, transitioning from random to a strong rolling texture at 60% strain. Differential rolling speeds led to varying surface hardness, more pronounced at higher strains. The 60% rolled sheet exhibited the highest yield stress (899.5&#xa0;MPa) and ultimate tensile stress (946.8&#xa0;MPa) but the lowest elongation (9.1%), attributed to increased work hardening. Despite reduced dimple density, ductile fracture mode persisted. Void formation on the fracture surface was driven by decohesion at α/α' interfaces. These findings highlight the role of ASR and martensite in enhancing mechanical performance while maintaining ductility in ferritic stainless steel.</p>

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Enhancing Strength–Ductility Balance in Ferritic Stainless Steel via High-Temperature Annealing and Subsequent Rolling

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Hossein Aghamohammadi,
  • Roohollah Jamaati

摘要

This study investigates the impact of high-temperature annealing and subsequent asymmetric rolling (ASR) on the mechanical properties of AISI430 ferritic stainless steel. A bimodal microstructure with martensite islands was created via heat treatment and quenching, followed by 60% asymmetric cold rolling. Results show a progressive grain size reduction with increase in rolling strain. At 60% strain, deformation bands formed in coarse grains, while fine grains displayed curvature due to hard martensite islands. Dislocation density and rolling texture also increased, transitioning from random to a strong rolling texture at 60% strain. Differential rolling speeds led to varying surface hardness, more pronounced at higher strains. The 60% rolled sheet exhibited the highest yield stress (899.5 MPa) and ultimate tensile stress (946.8 MPa) but the lowest elongation (9.1%), attributed to increased work hardening. Despite reduced dimple density, ductile fracture mode persisted. Void formation on the fracture surface was driven by decohesion at α/α' interfaces. These findings highlight the role of ASR and martensite in enhancing mechanical performance while maintaining ductility in ferritic stainless steel.