Effect of cold metal transfer (CMT) on the microstructure of as welded 2205 duplex stainless steel
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R. Nagar
Reena Nagar received her Master of Engineering degree in Metallurgical & Materials engineering (Industrial Metallurgy) from the department of Metallurgical & Materials engineering department, The Maharaja Sayajirao University of Baroda. Currently working as Temporary Assistant Professor at The Maharaja Sayajirao University of Baroda, Teaching the subjects material science, physical metallurgy& basic metallurgy.
,
C. Gohil
Vandana Rao She is working as an associate professor at Metallurgical and Materials Engineering department, Faculty of Technology and engineering, The Maharaja Sayajirao university of Baroda.
Abstract
This work aims to study the microstructural variations in 2205 duplex stainless steel welded by cold metal transfer. Duplex stainless steels, characterized by their twophase microstructure of austenite and ferrite, exhibit exceptional mechanical properties and corrosion resistance that can be significantly influenced by welding techniques. Plates of 8 mm thickness, solution annealed at 1070 ˚C, were joined using ER 2209 welding wire and a shielding gas mixture of 98 % Argon and 2 % O2. Microstructural analysis and ferrite content measurements were performed on the welded specimens. The microstructure was observed using three different electrolytic etchants 45KOH, 10KOH and 40NaOH Results showed that the best contrast of microstructure phases is seen in 45KOH etchant, resulting in dark green ferrite and yellow colored austenite as compared to 10KOH and 40NaOH etchant. Various morphologies of austenite were observed in the weld area. The base metal contains elongated pools of austenite in the ferrite matrix. The heat affected zone shows higher percentage of ferrite phase and the weld region shows highest austenite content with different morphologies like grain boundary Austenite, side plates of austenite or Widmanstätten austenite and intergranular austenite.
Kurzfassung
Diese Arbeit befasst sich mit der Untersuchung der mikrostrukturellen Veränderungen des nichtrostenden Duplexstahls 2205 nach dem Cold Metal Transfer Schweißen. Duplex-Edelstähle zeichnen sich durch eine zweiphasige Mikrostruktur aus Austenit und Ferrit aus und besitzen außergewöhnliche mechanische Eigenschaften und Korrosionsbeständigkeit, die durch die Schweißtechnik wesentlich beeinflusst werden können. 8 mm dicke Bleche, die bei 1070 °C lösungsgeglüht wurden, wurden mit einem Schweißdraht ER 2209 und einem Schutzgasgemisch aus 98 % Argon und 2 % O2 gefügt. An den geschweißten Proben wurden Gefügeuntersuchungen und Messungen des Ferritgehalts durchgeführt. Das Gefüge wurde mit drei verschiedenen elektrolytischen Ätzmitteln (45KOH, 10KOH und 40NaOH) untersucht. Die Ergebnisse zeigten, dass der beste Kontrast der Phasen im Gefüge mit dem Ätzmittel 45KOH erzielt wurde, das im Vergleich zu den Ätzmitteln 10KOH und 40NaOH dunkelgrünen Ferrit und gelben Austenit ergab. In der Schweißzone wurden verschiedene Austenitmorphologien beobachtet. Das Grundmetall enthält längliche Austenit-Inseln in der Ferrit-Matrix. Die Wärmeeinflusszone weist einen höheren Ferritgehalt auf, während die Schweißzone den höchsten Austenitgehalt mit verschiedenen Morphologien wie Korngrenzenaustenit, Widmanstätten-Austenit und intergranularen Austenit aufweist.
About the authors
Reena Nagar received her Master of Engineering degree in Metallurgical & Materials engineering (Industrial Metallurgy) from the department of Metallurgical & Materials engineering department, The Maharaja Sayajirao University of Baroda. Currently working as Temporary Assistant Professor at The Maharaja Sayajirao University of Baroda, Teaching the subjects material science, physical metallurgy& basic metallurgy.
Vandana Rao She is working as an associate professor at Metallurgical and Materials Engineering department, Faculty of Technology and engineering, The Maharaja Sayajirao university of Baroda.
References / Literatur
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- Editorial
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- Investigation of mechanical and metallographic properties of dissimilar aluminum alloy plates joined by friction stir welding method
- Effect of high-temperature titanium alloy ring forging microstructure on ultrasonic testing
- Effect of cold metal transfer (CMT) on the microstructure of as welded 2205 duplex stainless steel
- Failure Analysis
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- Picture of the Month
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Articles in the same Issue
- Inhalt
- Editorial
- Editorial
- Investigation of mechanical and metallographic properties of dissimilar aluminum alloy plates joined by friction stir welding method
- Effect of high-temperature titanium alloy ring forging microstructure on ultrasonic testing
- Effect of cold metal transfer (CMT) on the microstructure of as welded 2205 duplex stainless steel
- Failure Analysis
- Metallurgical analysis of creep failure in M16 fastening bolts made of N80A
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
