Microstructural characteristics of different heat-affected zones in welded joints of UNS S32304 duplex stainless steel using the GMAW process: analysis of the pitting corrosion resistance

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY

Corrosion Reviews Pub Date : 2024-01-11 DOI:10.1515/corrrev-2023-0061

Eduardo V. Morales, A. Cruz-Crespo, Juan A. Pozo-Morejón, Jorge V. M. Oria, L. S. Araújo, I. Bott

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Abstract

Abstract The influence of specific microstructural characteristics on the properties of single-pass welding joints was assessed by optical processed images, transmission electron microscopy, microhardness measurements and corrosion tests conducted in various regions of the heat-affected zone (HAZ) in a lean duplex stainless steel. The welded joints were obtained with heat inputs of 1.5 and 2.5 kJ/mm using a gas metal arc welding (GMAW) process with a shielding gas enriched in Ar. Three selected regions in the HAZ showed different ferrite grain sizes and austenite fractions. The place in the welded joint where the HAZ was narrowest, and therefore experiences the highest cooling rate, is most prone to the formation of cubic CrN metastable nitrides. Conversely, the place where the HAZ was wider promotes the precipitation of stable Cr2N nitrides with more coalesced intragranular austenite (IGA) particles, where presumably random interfaces predominate. The HAZ region where the cooling rate was the highest presented more pitting corrosion resistance.

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使用 GMAW 工艺的 UNS S32304 双相不锈钢焊接接头中不同热影响区的微观结构特征：耐点蚀性分析

摘要通过光学处理图像、透射电子显微镜、显微硬度测量以及在贫双相不锈钢热影响区（HAZ）的不同区域进行的腐蚀试验，评估了特定微观结构特征对单道焊接接头性能的影响。焊接接头是在输入热量为 1.5 和 2.5 kJ/mm 的情况下，使用富含氩气的保护气体进行气体金属弧焊 (GMAW) 工艺焊接的。HAZ 中的三个选定区域显示出不同的铁素体晶粒尺寸和奥氏体分数。焊点中 HAZ 最窄的地方冷却速度最高，因此最容易形成立方体 CrN 可转移氮化物。相反，HAZ 较宽的地方会促进稳定的 Cr2N 氮化物的析出，这些氮化物带有更多凝聚的晶粒内奥氏体 (IGA) 颗粒，在这里随机界面占主导地位。冷却速度最高的 HAZ 区域具有更强的抗点蚀能力。

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

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.