Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel
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 subseque...
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MDPI AG
2024-02-01
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| Online Access: | https://www.mdpi.com/2075-4701/14/2/193 |
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| author | Jingran Yang Xingfu Li Cong Li Zhuangdi Zhou Shuwei Quan Zhuang Kang Shen Qin Lele Sun Bo Gao Xinkun Zhu |
| author_facet | Jingran Yang Xingfu Li Cong Li Zhuangdi Zhou Shuwei Quan Zhuang Kang Shen Qin Lele Sun Bo Gao Xinkun Zhu |
| author_sort | Jingran Yang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-07T22:21:56Z |
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| id | doaj.art-92d5f153d4584674b74a0d064a793b26 |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-07T22:21:56Z |
| publishDate | 2024-02-01 |
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| spelling | doaj.art-92d5f153d4584674b74a0d064a793b262024-02-23T15:27:19ZengMDPI AGMetals2075-47012024-02-0114219310.3390/met14020193Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless SteelJingran Yang0Xingfu Li1Cong Li2Zhuangdi Zhou3Shuwei Quan4Zhuang Kang5Shen Qin6Lele Sun7Bo Gao8Xinkun Zhu9Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaNano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaSAF2507 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.https://www.mdpi.com/2075-4701/14/2/193duplex stainless steelheterogeneous structuremechanical propertiesmicrostructure characterizationHDI strengthening and strain hardening |
| spellingShingle | Jingran Yang Xingfu Li Cong Li Zhuangdi Zhou Shuwei Quan Zhuang Kang Shen Qin Lele Sun Bo Gao Xinkun Zhu Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel Metals duplex stainless steel heterogeneous structure mechanical properties microstructure characterization HDI strengthening and strain hardening |
| title | Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel |
| title_full | Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel |
| title_fullStr | Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel |
| title_full_unstemmed | Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel |
| title_short | Heterogeneous Microstructure Provides a Good Combination of Strength and Ductility in Duplex Stainless Steel |
| title_sort | heterogeneous microstructure provides a good combination of strength and ductility in duplex stainless steel |
| topic | duplex stainless steel heterogeneous structure mechanical properties microstructure characterization HDI strengthening and strain hardening |
| url | https://www.mdpi.com/2075-4701/14/2/193 |
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