UNS S32205 duplex stainless steel plates were welded to AISI 316L 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.

中文翻译：

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使用奥氏体，超奥氏体和超双相填充金属对S32205 / 316L异种焊缝进行表征

将UNS S32205双相不锈钢板通过脉冲钨极电弧焊工艺与AISI 316L不锈钢焊接，并使用三种不同的填充金属：ER2594，ER312和ER385。使用光学和扫描电子显微镜对焊缝的显微组织进行表征，并通过铁素体测量对所有试样进行评估。通过硬度，拉伸和冲击试验研究了机械性能。另外，计算耐点蚀当量数并进行循环极化试验以评价焊接金属的耐腐蚀性。结果表明，在双面的热影响区中形成了氮化铬，而在任何样品中均未检测到σ相。铁氧体数量从根部通过到最终通过。冲击试验的吸收能量随着铁素体数的增加而降低，而抗拉强度却提高了。用ER385焊接的试样的全奥氏体显微组织在25°C时表现出最高的抗点蚀性能，而超双相焊缝金属在50°C时表现出优异的抗腐蚀性。