不同Mn/N比固溶处理22% Cr贫双相不锈钢的力学和点蚀行为研究

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Ironmaking & Steelmaking Pub Date : 2023-03-22 DOI:10.1080/03019233.2023.2188522

Gaoling Xia, Shiyu Wu, Yinhui Yang, Xiaoyu Pan, Tao Yuan, Zihao Gao, Zhixin Gao

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引用次数: 0

摘要

研究了Mn/N比对固溶处理22% Cr贫双相不锈钢(DSS)组织演变、力学性能和点蚀性能的影响。随着Mn/N比的降低，氮加入量的增加增强了固溶体效应，拉伸强度、屈服强度和伸长率均有所提高，在Mn/N比为17.80时达到两相平衡。当Mn/N比从3.28增加到17.80时，Cr2N含量的减少、铁素体中位错细胞的增多和奥氏体中滑移带的增多导致韧性增加，而当Mn/N比为54.14时，σ析出物和铁素体分数的增加导致韧性降低。此外，17.80 Mn/N比的DSS比2205 DSS具有更高的抗点蚀性能，这是由于钝化膜形成更厚、更致密，但当Mn/N比为54.14时，钝化膜形成更松散，降低了DSS的抗点蚀性能。

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Investigation on the mechanical and pitting corrosion behaviour of solution-treated 22% Cr lean duplex stainless steel with different Mn/N ratio

ABSTRACT Effect of Mn/N ratio on the microstructure evolution, mechanical and pitting corrosion properties of solution-treated 22% Cr lean duplex stainless steel (DSS) was investigated. As the Mn/N ratio decreased, tensile and yied strength, as well as elongation,increased due to the strengthening solid solution effect of more nitrogen addition, and two-phase equilibrium was obtained at 17.80 Mn/N ratio. The drop in the amount of Cr2N, more dislocation cell formation in ferrite and the increase of slip bands in austenite contributed to an increase in toughness with increasing Mn/N ratio from 3.28 to 17.80, whereas more σ precipitates and ferrite fraction resulted in a decrease of it at 54.14 Mn/N ratio. Moreover, higher pitting corrosion resistance was obtained for 17.80 Mn/N ratio DSS than that for 2205 DSS due to the thicker and more compact passive film formation, but higher Mn/N ratio of 54.14 decreased it with more loose MnO formation.

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.