Investigation of microstructure and corrosion resistance of AISI 304 stainless steel joint with ER308 and ERNiCr-3 filler metals by GTAW

Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI:10.1051/metal/2020048

M. Jafarzadegan, F. Ahmadian, V. Salarvand, Souren Kashkooli

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引用次数: 1

Abstract

In this study, the effect of two different filler metals (ERNiCr-3 and ER308) on microstructure and corrosion resistance of gas tungsten arc welded AISI 304 has been investigated. The microstructure of the joints was investigated by optical and scanning electron microscope. The microhardness of samples was investigated to determine the mechanical properties of the welds. Also, the electrochemical corrosion resistance of the samples was studied by Tafel polarization and impedance analysis in 1 M hydrochloric acid. The results showed the niobium-rich carbides in the welded specimen by ERNiCr-3 filler, also this sample exhibited a higher hardness and corrosion resistance. The exchange current density and the polarization radius of the ERNiCr-3 filler metal were 0.069 mA and 244 Ω, and those of ER308 filler metal were 0.121 mA and 66 Ω, respectively. The higher hardness and corrosion resistance is attributed to the formation of hard niobium-rich carbides in the weld zone, which eliminates the formation of chromium carbides.

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用GTAW研究ER308和ERNiCr-3填充金属对AISI 304不锈钢接头的显微组织和耐蚀性

研究了ERNiCr-3和ER308两种不同钎料对AISI 304气体保护钨极弧焊组织和耐蚀性的影响。采用光学显微镜和扫描电镜对接头的显微组织进行了研究。对试样进行显微硬度测定，以确定焊缝的力学性能。通过Tafel极化和阻抗分析，研究了样品在1 M盐酸中的电化学耐蚀性。结果表明，ERNiCr-3钎料焊接试样中含有富铌碳化物，且具有较高的硬度和耐蚀性。ERNiCr-3填充金属的交换电流密度和极化半径分别为0.069 mA和244 Ω， ER308填充金属的交换电流密度和极化半径分别为0.121 mA和66 Ω。较高的硬度和耐腐蚀性是由于在焊接区形成了坚硬的富铌碳化物，从而消除了碳化铬的形成。

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Revue De Metallurgie-cahiers D Informations Techniques 工程技术-冶金工程

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24 months