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Characterizations of dissimilar S32205/316L welds using austenitic, super-austenitic and super-duplex filler metals

International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 119-127页

作者： A.Taheri b.beidokhti b.shayegh b.roujeny A.Valizadeh Department of Materials Engineering Najafabad BranchIslamic Azad UniversityIsfahan ***Iran Materials and Metallurgical Engineering Department Faculty of EngineeringFerdowsi University of MashhadMashhad ***Iran Department of Engineering Shahrekord UniversityShahrekord 88186-34141Iran brunel Centre for Advanced Solidification Technology(bCAST) Brunel UniversityUxbridge UB83PHUK

UNS S32205 duplex stainless steel plates were welded to AISI 316 L stainless steel using the pulsed gas tungsten arc welding process with three different filler metals: ER2594, ER312, and ER385. The microstructures of the welds were characterized using optical and scanning electron microscopy, and all of the specimens were evaluated by ferrite measurements. The mechanical properties were studied through hardness,tensile, and impact tests. In addition, the pitting resistance equivalent number was calculated and cyclic polarization tests were performed to evaluate the corrosion resistance of the weld metal. The results showed that chromium nitride was formed in the heat-affected zone of the duplex side,whereas no sigma phase was detected in any of the specimens. The ferrite number increased from the root pass to the final pass. The absorbed energies of the impact test decreased with increasing ferrite number, whereas the tensile strength was enhanced. The fully austenitic microstructure of the specimen welded with ER385 exhibited the highest resistance to pitting corrosion at 25°C, and the super-duplex weld metal presented superior corrosion resistance at 50°C.

关键词： stainless steel mechanical properties microstructure welding

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Effects of strain-induced melt activation treatment on the microstructure and properties of Zn sacrificial anodes

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International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1693-1704页

作者： behrooz shayegh b.roujeny Payam Raiesi Goojani Ehsan Akbari Department of Engineering Shahrekord UniversityShahrekordIran

The microstructural properties and electrochemical performance of zinc(Zn)sacrificial anodes during strain-induced melt activation(SIMA)were investigated in this *** samples were subjected to a compressive ratio of 20%-50% at various temperatures(425-435℃)and durations(5-30 min).Short-term electrochemical tests(anode tests)based on DNV-RP-b401 and potentiodynamic polarization tests were performed in 3.5wt%NaCl solution to evaluate the electrochemical efficiency and corrosion behavior of the samples,*** electrochemical test results for the optimum sample confirmed that the corrosion current density declined by 90% and the anode efficiency slightly decreased relative to that of the raw ***-dispersive X-ray spectroscopy,scanning electron microscopy,metallographic images,and microhardness profiles showed the accumulation of alloying elements on the boundary and the conversion of uniform corrosion into localized corrosion,hence the decrease of the Zn sacrificial anode’s efficiency after the SIMA process.

关键词： strain-induced melt activation process zinc sacrificial anode corrosion resistance anode test

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