Improved Mechanical Property and Corrosion Resistance of SAF2507 Duplex Stainless Steel with Heterogeneous Lamella Structure

He, Jing-Sheng; Chen, Ming; Li, Jiansheng; Wang, Chengxi; Xing, Shilong; Liu, Qi

doi:10.1002/srin.202100360

Cited by 7 publications

(1 citation statement)

References 38 publications

(42 reference statements)

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“…However, the grain size of the FCC phase is not significantly different from the corresponding rolled sample, and a large number of recrystallized grains appear near the twin boundaries of the FCC phase (Figure 4(e-2)). The reason for this phenomenon is that the stacking fault energy of the austenite (FCC) phase is lower than that of the ferrite (BCC) phase [16]. During the deformation process, the austenite phase with lower stacking fault energy will accumulate more lattice distortion and produce more crystal defects such as stacking faults and twins [17].…”

Section: Ebsd Analysismentioning

confidence: 99%

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Yang,

Li,

et al. 2024

Metals

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SAF2507 duplex stainless steel (DSS) is often used as a structural component in ocean-going vessels and marine petroleum exploitation equipment, which require superior mechanical properties. In this study, we used cold rolling (CR) at room temperature with 55% or 80% deformation amounts and subsequent annealing at 1273 K in 1 min to prepare SAF2507 samples with a heterogeneous structure (HS) that was composed of ferrite and austenite phases with different grain sizes. Compared with the homogeneous structure samples, the yield strength of the HS samples increased, while the ductility did not decrease. The 55%-1273 and 80%-1273 samples exhibited the hetero-zone boundary-affected regions on both sides of the grain boundary, phase boundary, and twin boundary. This resulted in hetero-deformation-induced (HDI) strengthening and strain hardening of samples during tensile deformation, which improved the ultimate tensile strength of the HS samples while maintaining a good uniform elongation. In addition, the heterogeneous structure of DSS had better corrosion resistance than the initial sample of coarse grain (CG) structure; mainly because the HS samples had finer grains and more grain boundaries on the DSS surface than the CG structure, which is conducive to the formation of high-density passivation film on the surface of stainless steel. The current study provides a new method of material selection of some structural components with the demands of high strength and good ductility.

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Section: Ebsd Analysismentioning

confidence: 99%

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Yang,

Li,

et al. 2024

Metals

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Heterostructured Metallic Structural Materials: Research Methods, Properties, and Future Perspectives

Dong,

Gao,

Xiao

et al. 2024

Adv Funct Materials

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Heterostructured (HS) materials, characterized by heterogeneous zones with differences in mechanical or physical properties, represent a revolutionary advancement in material science. During deformation, hetero‐deformation‐induced (HDI) stress forms due to the synergistic interactions between soft and hard zones, leading to remarkable HDI strengthening and strain hardening. This mechanism significantly enhances their performance, surpassing that of traditional homogeneous materials. This review delves into the classification, preparation techniques, fundamental deformation mechanisms, and research methods of HS materials. It outlines the preparation methods of various HS materials, emphasizing their unique characteristics and applications. The review elaborates on the fundamental deformation mechanisms of HS materials, focusing on non‐uniform plastic deformation behavior and HDI strain hardening. Furthermore, it explores the application of heterogeneous design concepts in materials, analyzing their microstructure tuning mechanisms and mechanical properties. This review aims to serve as a critical reference for the future design and development of new HS metallic structural materials, paving the way for innovations that can transform multiple industries. By highlighting the long‐term impact, this review not only enhances the understanding of HS materials but also provides a roadmap for future research and industrial applications, positioning HS materials as key players in the advancement of material technology.

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Duplex corrosion mechanisms correlated to α/γ phase selection in containerlessly processed Fe-Cr-Ni-Mo alloy

Sun

Ruan

et al. 2023

Corrosion Science

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Improved Mechanical Property and Corrosion Resistance of SAF2507 Duplex Stainless Steel with Heterogeneous Lamella Structure

Abstract: Figure 10. a) Nyquist plots and b) Bode plots for the as-received and annealed samples in 3.5 wt% NaCl solution.

Cited by 7 publications

References 38 publications

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel

Heterostructured Metallic Structural Materials: Research Methods, Properties, and Future Perspectives

Duplex corrosion mechanisms correlated to α/γ phase selection in containerlessly processed Fe-Cr-Ni-Mo alloy

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