Dissimilar welding of super-duplex and super-austenitic stainless steels

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• 作者：Zhiliang Zhou ; Johan Löthman
• 关键词：(IIW Thesaurus)Dissimilar materials ; Stainless steels ; Nickel alloys ; Intermetellics ; Filler materials ; Mechanical properties ; Pitting corrosion ; GTA welding
• 刊名：Welding in the World
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：61
• 期：1
• 页码：21-33
• 全文大小：
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：61

文摘

Dissimilar welding of super-duplex stainless steel 2507 (UNS S32750) to super-austenitic stainless steel 6Mo (UNS S31254) was studied using nickel-alloy filler materials ERNiCrMo-13 and ERNiCrMo-3 as well as super-duplex filler material ER2594 in GTAW. It was shown that mechanical properties of the dissimilar welded joints made with nickel-alloy filler materials and super-duplex stainless steel filler meet the requirements in the related international standards. Intermetallic phases were found in the 2507 fusion line and the weld metals with nickel-alloy filler materials while intermetallic phases were observed in the 6Mo fusion line with super-duplex filler. Intermetallic phases were observed in the weld metals with super-duplex filler and shielding gas of pure Ar, but not with the same filler and shielding gas of Ar + 2%N₂. The dissimilar welded joints have passed the ASTM G48A test at 45 °C made with nickel-alloy filler materials ERNiCrMo-13 and ERNiCrMo-3, at 40 °C with super-duplex filler and shielding gas of Ar + 2%N₂, and at 35 °C with super-duplex filler and shielding gas of pure Ar. Based on the mechanical properties and pitting corrosion resistance of the dissimilar welded joints of 2507 to 6Mo, the filler material can be ERNiCrMo-13 as the first choice, ERNiCrMo-3 as the second choice and super-duplex filler ER2594 together with shielding gas of Ar + 2%N₂ as the third.