Pitting behavior of austenitic stainless-steel welded joints with dense inclusions and methods to enhance pitting resistance

IF 2.3 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
QingYuan Zhou, Yangting Sun, Xiangyu Wang, Xin Tan, Yiming Jiang, Jin Li
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Abstract

Purpose

This study aims to assess the pitting resistance of austenitic stainless steel welded joints fusion zone (FZ) with high density of inclusions before and after surface treatment, including potentiostatic pulse technique (PPT) and pickling.

Design/methodology/approach

The potentiodynamic polarization tests and critical pitting temperature tests were carried out for estimating pitting resistance. The PPT and pickling were performed as surface treatment. Scanning electron microscope (SEM) and energy dispersive spectrometer were used for characterize the microstructure and elemental distribution. Electron back-scattered diffraction (EBSD) was used to assess the portion of phases and morphology of grains.

Findings

The weld metal exhibits a higher degree of alloying compared to the base metal, and it contains d-phase and sulfur-containing inclusions. Sulfur-containing inclusions serve as initiation sites for pitting, and they diminish the pitting resistance of weld metal. Both PPT and pickling can remove sulfur-containing inclusions, but PPT causes localized dissolution of the weld metal matrix around the inclusions, while pickling does not. Because of the high density of inclusions, certain pits initiated by PPT are significantly deeper, which makes the formation of stable pitting easier. Because of the high density of inclusions, certain pits initiated by the PPT are deeper. This characteristic facilitates the progression of these initial defects into fully developed, stable pits.

Originality/value

Analysis of pitting initiation in shielded metal arc welding FZ with PPT and ex situ SEM tracking observation. Explanation of why the PPT surface treatment is not able to enhance the pitting resistance of stainless steel with a high inclusion density.

含有致密夹杂物的奥氏体不锈钢焊接接头的点蚀行为以及增强抗点蚀能力的方法
目的 本研究旨在评估具有高密度夹杂物的奥氏体不锈钢焊接接头熔合区(FZ)在表面处理(包括恒电位脉冲技术(PPT)和酸洗)前后的抗点蚀性。PPT 和酸洗是作为表面处理进行的。扫描电子显微镜(SEM)和能量色散光谱仪用于表征微观结构和元素分布。研究结果与母材相比,焊缝金属的合金化程度较高,并含有 d 相和含硫夹杂物。含硫夹杂物是点蚀的起始点,会降低焊接金属的抗点蚀能力。PPT 和酸洗都能去除含硫夹杂物,但 PPT 会导致夹杂物周围的焊接金属基体局部溶解,而酸洗则不会。由于夹杂物密度高,某些由 PPT 引发的点蚀会明显加深,从而更容易形成稳定的点蚀。由于夹杂物密度高,某些由 PPT 引发的凹坑会更深。原创性/价值分析采用 PPT 和原位 SEM 跟踪观察的保护金属弧焊 FZ 中的点蚀引发情况。解释为什么 PPT 表面处理无法增强具有高夹杂密度的不锈钢的抗点蚀能力。
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来源期刊
Anti-corrosion Methods and Materials
Anti-corrosion Methods and Materials 工程技术-冶金工程
CiteScore
2.80
自引率
16.70%
发文量
61
审稿时长
13.5 months
期刊介绍: Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.
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