Comparative analysis of structural and mechanical properties of duplex stainless steel (DSS) weldments prepared by flux core arc welding and shielded metal arch welding processes

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
E. Ajenifuja , A.P.I. Popoola , O. Popoola
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Abstract

Duplex stainless steel (DSS) possesses wide range of useful metallographic and mechanical properties; hence the material has been used in different forms of application namely in chloride present environments such as desalination plants and cooling water services such as conventional and nuclear power stations. However, this material has its limitations as it's susceptible to cracking particularly stress corrosion cracking or pitting corrosion and can exhibit poor metallurgical properties such as microstructures and phase containing unbalanced proportions of ferrite and austenite. In this study, Flux Core Arc Welding (FCAW) is compared with Shielded Metal Arch Welding (SMAW) process, in terms of their effects on the structural and mechanical properties and performances of DSS weldments. Analysis of the microstructure and phases were carried out. Also, the tensile, microhardness, impact and fracture properties were determined with relevant techniques. The results indicated that SMAW and FCAW welding processes differentially influence the structural and mechanical properties of the DSS weldments, consisting of the part of base material, weld and the heat affected zone (HAZ). The weld prepared using the SMAW process exhibited superior hardness characteristics at 309 HV and achieved the highest impact energy absorption of 145.92 J. In contrast, the FCAW prepared weldment exhibited the highest tensile strength, reaching 282.30 kN maximum load.
双相不锈钢(DSS)焊条药芯电弧焊与保护金属拱焊结构与力学性能的对比分析
双相不锈钢(DSS)具有广泛的实用金相和力学性能;因此,该材料已被用于不同形式的应用,即在氯化物存在的环境中,如海水淡化厂和冷却水服务,如常规和核电站。然而,这种材料有其局限性,因为它容易开裂,特别是应力腐蚀开裂或点蚀,并且可能表现出较差的冶金性能,例如微观结构和含铁素体和奥氏体比例不平衡的相。在本研究中,比较了药芯电弧焊(FCAW)与保护金属弧焊(SMAW)工艺对DSS焊接件的结构、力学性能和性能的影响。进行了显微组织和物相分析。用相关技术测定了材料的拉伸性能、显微硬度、冲击性能和断裂性能。结果表明,SMAW和FCAW焊接工艺对DSS焊件的组织性能和力学性能有不同的影响,包括母材部分、焊缝和热影响区。采用SMAW工艺制备的焊缝在309 HV时具有优异的硬度特性,达到了145.92 j的最大冲击吸能,而采用FCAW工艺制备的焊件具有最高的抗拉强度,达到了282.30 kN的最大载荷。
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
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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