Design for improving corrosion resistance of duplex stainless steels by wrapping inclusions with niobium armour

Shucai Zhang, Hao Feng, Huabing Li (), Zhouhua Jiang, Tao Zhang, Hongchun Zhu, Yue Lin, Wei Zhang and Guoping Li
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Shucai Zhang: Northeastern University
Hao Feng: Northeastern University
Huabing Li: Northeastern University
Zhouhua Jiang: Northeastern University
Tao Zhang: Northeastern University
Hongchun Zhu: Northeastern University
Yue Lin: Northeastern University
Wei Zhang: Central Iron and Steel Research Institute
Guoping Li: Shanxi Taigang Stainless Steel Co., Ltd.

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Unavoidable nonmetallic inclusions generated in the steelmaking process are fatal defects that often cause serious corrosion failure of steel, leading to catastrophic accidents and huge economic losses. Over the past decades, extensive efforts have been made to address this difficult issue, but none of them have succeeded. Here, we propose a strategy of wrapping deleterious inclusions with corrosion-resistant niobium armour (Z phase). After systematic theoretical screening, we introduce minor Nb into duplex stainless steels (DSSs) to form inclusion@Z core-shell structures, thus isolating the inclusions from corrosive environments. Additionally, both the Z phase and its surrounding matrix possess excellent corrosion resistance. Thus, this strategy effectively prevents corrosion caused by inclusions, thereby doubly improving the corrosion resistance of DSSs. Our strategy overcomes the long-standing problem of “corrosion failure caused by inclusions”, and it is verified as a universal technique in a series of DSSs and industrial production.

Date: 2023
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DOI: 10.1038/s41467-023-43752-8

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