Effect of Mn Content on the Microstructure and Corrosion Resistance of Duplex Stainless Steels Fabricated by Wire Arc Additive Manufacturing

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-11-29 DOI:10.1007/s12540-024-01842-2

Shuainan Song, Gang Li, Biao Wu, Qun Cai, Xiangwei He

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Abstract

Duplex stainless steels (DSSs) fabricated by wire arc additive manufacturing (WAAM) have been attracted significant attention by researchers due to their good mechanical properties and corrosion resistance. In this study, nickel-saving cored wires are developed as filler wire for the DSSs via WAAM process. The effect of Mn content on the microstructure and corrosion resistance of WAAM-ed DSSs is studied in detail. The results indicate multiple kinds of austenite including grain boundary austenite, Widmanstätten austenite and intragranular austenite grains are formed among the ferrite in the deposited metals. The ferrite–austenite phase balance can be obtained in the deposited metals. The impedance polarization indicates that the charge transfer resistance increases, whereas the corrosion current density of the deposited metals decreases with increasing the Mn content. From the corrosion morphology, it is observed that the corrosion pits become shallower and decrease on the deposited metals with increasing the Mn content. The increase of Mn content improves the corrosion resistance of the deposited metals via WAAM process.

Graphical Abstract

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Mn含量对电弧增材制造双相不锈钢组织及耐蚀性的影响

电弧增材制造双相不锈钢（DSSs）由于具有良好的力学性能和耐腐蚀性而受到研究人员的广泛关注。本研究采用WAAM工艺，研制出了含镍的包芯焊丝作为DSSs的填充焊丝。详细研究了Mn含量对waam - edss显微组织和耐蚀性的影响。结果表明，沉积金属中的铁素体中形成了晶界奥氏体、Widmanstätten奥氏体和晶内奥氏体等多种奥氏体。在沉积金属中可以获得铁素体-奥氏体相平衡。阻抗极化表明，随着Mn含量的增加，镀层的电荷转移电阻增大，腐蚀电流密度减小。从腐蚀形貌来看，随着Mn含量的增加，沉积金属表面的腐蚀坑逐渐变浅，腐蚀坑逐渐减小。Mn含量的增加提高了WAAM工艺沉积金属的耐蚀性。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.