Influence of MC Carbides on Pitting Corrosion Resistance of Weld Metal in Austenitic Stainless Steels

IF 1.6 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Isij International Pub Date : 2024-06-10 DOI:10.2355/isijinternational.isijint-2024-067

Kota Kadoi, Yudai Kanno, So Aoki, Hiroshige Inoue

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Abstract

The influence of MC-type carbide formation on pitting corrosion resistance in weld metal of austenitic stainless steel was investigated. The relationship between the microstructure such as carbides and element distribution, and pitting corrosion resistance of the simulated weld metal of austenitic stainless steel was studied. The addition of molybdenum improved the pitting corrosion resistance. The effect of niobium addition on the pitting resistance was negligible. However, the addition of titanium significantly reduced the pitting corrosion resistance. The addition of niobium or titanium induced the formation of MC-type carbides, such as TiC and NbC, at the cellular boundaries. The pits were mainly initiated near or at carbides. The chromium depletion zone was formed near M₂₃C₆coexisting with TiC only in the specimen added titanium. Thus, TiC formed during solidification accelerated the chromium diffusion-associated M₂₃C₆precipitation on TiC. The depletion zone deteriorated the pitting corrosion resistance of the titanium-containing specimen.

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MC 碳化物对奥氏体不锈钢焊接金属抗点蚀性的影响

研究了 MC 型碳化物的形成对奥氏体不锈钢焊缝金属抗点蚀性的影响。研究了碳化物和元素分布等微观结构与奥氏体不锈钢模拟焊缝金属耐点蚀性之间的关系。钼的加入提高了耐点蚀性。添加铌对抗点蚀性能的影响可以忽略不计。然而，钛的加入则大大降低了抗点蚀性。铌或钛的添加会在晶胞边界形成 MC 型碳化物，如 TiC 和 NbC。凹坑主要在碳化物附近或碳化物处形成。只有在添加钛的试样中，才会在与 TiC 共存的 M23C6 附近形成铬贫化区。因此，凝固过程中形成的 TiC 加速了 TiC 上与铬扩散相关的 M23C6 沉淀。贫化区恶化了含钛试样的抗点蚀性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Isij International 工程技术-冶金工程

CiteScore

3.40

自引率

16.70%

发文量

268

审稿时长

2.6 months

期刊介绍： The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.