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

被引:2
|
作者
Yang, Jingran [1 ,2 ]
Li, Xingfu [1 ]
Li, Cong [1 ]
Zhou, Zhuangdi [1 ]
Quan, Shuwei [1 ]
Kang, Zhuang [1 ]
Qin, Shen [1 ]
Sun, Lele [1 ]
Gao, Bo [3 ]
Zhu, Xinkun [1 ]
机构
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China
[2] Kunming Univ Sci & Technol, City Coll, Kunming 650504, Peoples R China
[3] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
关键词
duplex stainless steel; heterogeneous structure; mechanical properties; microstructure characterization; HDI strengthening and strain hardening; CORROSION BEHAVIOR; RESISTANCE; SYNERGY; ALLOYS; COLD;
D O I
10.3390/met14020193
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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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页数:17
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