A Novel Cu-Modified 20Cr Lean Duplex Stainless Steel with Exceptional Combination of Mechanical Properties and Corrosion Resistance

IF 3.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2025-04-24 DOI:10.1007/s40195-025-01864-8

Zheng-Hong Liu, Ying Han, Jia-Peng Sun, Ming-Kun Jiang, Ying Song, Guo-Qing Zu, Xu Ran

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Abstract

Over the past few years, the Cu element has attracted much attention in duplex stainless steels. It undoubtedly holds advantageous in regulating the two-phase proportion and austenite stability and is also one of the crucial factors affecting the corrosion resistance. However, the systematic research on the impact of Cu addition to lean duplex stainless steels remains insufficient. In this study, a novel Cu-alloyed Mn-N-type 20Cr lean duplex stainless steel was developed and the effect of Cu on the strain hardening capacity and corrosion resistance was analyzed. The results show that the Cu addition increases the volume fraction and stability of the austenite, retards the martensitic transformation, and extends the transformation-induced plasticity effect to a wider strain range. Compared to the Cu-free steel, the plasticity of Cu-containing steel can be increased by ~ 26%. Additionally, the addition of Cu redistributes the Cr and N elements in the ferrite and austenite phases, thereby improving the corrosion resistance of the lean duplex stainless steel.

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一种新型cu改性20Cr精益双相不锈钢，具有优异的机械性能和耐腐蚀性

近年来，Cu元素在双相不锈钢中引起了广泛的关注。它在调节两相比例和奥氏体稳定性方面无疑具有优势，也是影响耐蚀性的关键因素之一。然而，对于添加Cu对精益双相不锈钢的影响，目前还缺乏系统的研究。研制了一种新型Cu合金mn - n型20Cr贫双相不锈钢，分析了Cu对其应变硬化能力和耐蚀性的影响。结果表明：Cu的加入提高了奥氏体的体积分数和稳定性，延缓了马氏体的相变，并将相变诱发的塑性效应扩展到更大的应变范围；与不含cu钢相比，含cu钢的塑性可提高~ 26%。此外，Cu的加入使铁素体和奥氏体相中的Cr和N元素重新分布，从而提高了贫双相不锈钢的耐腐蚀性。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.