Microstructural and Corrosion Behavior of Thin Sheet of Stainless Steel-Grade Super Duplex 2507 by Gas Tungsten Arc Welding

IF 0.6 Q4 TRANSPORTATION SCIENCE & TECHNOLOGY

SAE International Journal of Materials and Manufacturing Pub Date : 2024-03-21 DOI:10.4271/05-17-02-0011

Sujeet Kumar, Yogesh Kumar, Vimal K. E. K.

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引用次数: 0

Abstract

Super duplex stainless steel (SDSS) is a type of stainless steel made of chromium (Cr), nickel (Ni), and iron (Fe). In the present work, a 1.6 mm wide thin sheet of SDSS is joined using gas tungsten arc welding (GTAW). The ideal parameter for a bead-on-plate trial is found, and 0.216 kJ/mm of heat input is used for welding. As an outcome of the welding heating cycle and subsequent cooling, a microstructural study revealed coarse microstructure in the heat-affected zone and weld zone. The corrosion rate for welded joints is 9.3% higher than the base metal rate. Following the corrosion test, scanning electron microscope (SEM) analysis revealed that the welded joint’s oxide development generated a larger corrosive attack on the weld surface than the base metal surface. The percentages of chromium (12.5%) and molybdenum (24%) in the welded joints are less than those in the base metal of SDSS, as per energy dispersive X-ray (EDX) analysis. Corrosion modeling is done using the COMSOL Multiphysics software. Electrochemical corrosion modeling is used to determine the electrolyte potential (i.e., 0.09 V) and current density (i.e., 0.2 A/m2 to 1.8 A/m2). An entire mesh model contains 6240 elements. The largest and smallest element sizes are 4 mm and 0.1 mm, respectively. The maximum element rate of growth is 1.2.

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利用气体钨极氩弧焊焊接不锈钢级超级双相钢 2507 薄板的微观结构和腐蚀行为

超级双相不锈钢（SDSS）是一种由铬（Cr）、镍（Ni）和铁（Fe）组成的不锈钢。本研究采用气体钨极氩弧焊 (GTAW) 焊接 1.6 毫米宽的 SDSS 薄板。找到了焊珠-板试验的理想参数，并使用 0.216 kJ/mm 的热输入进行焊接。作为焊接加热循环和随后冷却的结果，微观结构研究显示热影响区和焊接区的微观结构粗糙。焊接接头的腐蚀率比母材腐蚀率高 9.3%。腐蚀试验后，扫描电子显微镜（SEM）分析表明，与母材表面相比，焊点的氧化物发展对焊缝表面产生了更大的腐蚀作用。根据能量色散 X 射线（EDX）分析，焊点中铬（12.5%）和钼（24%）的含量低于 SDSS 母材中的含量。腐蚀建模使用 COMSOL Multiphysics 软件完成。电化学腐蚀模型用于确定电解质电位（即 0.09 V）和电流密度（即 0.2 A/m2 至 1.8 A/m2）。整个网格模型包含 6240 个元素。最大和最小的元素尺寸分别为 4 毫米和 0.1 毫米。最大元素增长率为 1.2。

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来源期刊

SAE International Journal of Materials and Manufacturing TRANSPORTATION SCIENCE & TECHNOLOGY-

CiteScore

1.30

自引率

12.50%

发文量