Effects of modes of metal transfer on microstructure of welded duplex stainless steel samples
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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
Sanjay N. Soman Ex-HOD & Professor in Metallurgical & Materials Engineering department, The Maharaja Sayajirao University of Baroda. He has completed is Ph.D from IIT Bombay.
Abstract
The aim of this work is to study the micro-structural variations of 2205 duplex stainless steel welded by the gas metal arc welding (GMAW) process in three transfer modes: spray transfer, globular transfer and dip transfer. Duplex stainless steels, characterized by a two-phase microstructure of austenite and ferrite, exhibit exceptional mechanical properties and corrosion resistance that can be significantly affected by welding techniques. Plates of 8 mm thickness, solution annealed at 1100 °C, were joined using ER 2209 welding wire and a shielding gas mixture of 98 % Argon and 2 % O2. Various welding parameters were optimized to maintain an interpass temperature below 100 °C and a heat input ranging from 0.38 to 1.20 kJ/mm. The microstructure was prepared and etched with KOH reagent and analyzed by optical microscopy. The results show that all welding modes resulted in a significant increase in ferrite content within the heat affected zone (HAZ), with the spray mode exhibiting the highest delta ferrite and a coarsened microstructure due to elevated temperatures and slow cooling rates. In the weld region, spray mode contains the highest amount of austenite phase and exhibits distinct morphologies including grain boundary austenite (GBA), Widmanstätten austenite (WA) and intergranular austenite (IGA). The lowest amount of austenite is found in the weld metal of the dip transfer mode.
Kurzfassung
Das Ziel dieser Arbeit ist die Untersuchung der mikrostrukturellen Veränderungen des nichtrostenden Duplexstahls 2205, der mittels Metall-Inertgasschweißen (MIG) in drei Modi geschweißt wurde: Sprüh-Transfer, Globular-Transfer und Kurzlichtbogen. Duplex-Edelstähle, die sich durch ein zweiphasiges Gefüge aus Austenit und Ferrit auszeichnen, besitzen außergewöhnliche mechanische Eigenschaften und eine hohe Korrosionsbeständigkeit, die durch die Schweißtechnik erheblich beeinflusst werden können. 8 mm dicke, bei 1100 °C lösungsgeglühte Bleche wurden mit dem Schweißdraht ER 2209 und einem Schutzgasgemisch aus 98 % Argon und 2 % O2 zusammengefügt. Verschiedene Schweißparameter wurden optimiert, um die Zwischenlagentemperatur unter 100 °C und die Wärmeeinbringung zwischen 0,38 und 1,20 kJ/mm zu halten. Die Mikrostruktur wurde mit KOH geätzt und anschließend mit einem Lichtmikroskop analysiert. Die Ergebnisse zeigen, dass alle Schweißverfahren zu einer deutlichen Erhöhung des Ferritgehaltes in der Wärmeeinflusszone (WEZ) führen, wobei das Sprüh-Transfer-Verfahren aufgrund der hohen Temperaturen und der langsamen Abkühlgeschwindigkeiten den höchsten Ferritgehalt und ein gröberes Gefüge aufweist. In der Schweißzone enthält die mittels Spray-Transfer geschweißte Probe den höchsten Anteil an Austenit und weist verschiedene Morphologien auf, einschließlich Korngrenzenaustenit (GBA), Widmanstätten-Austenit (WA) und intergranularem Austenit (IGA). Der geringste Austenitanteil findet sich im Schweißgut der mittels Kurzlichtbogen geschweißten Probe.
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.
Sanjay N. Soman Ex-HOD & Professor in Metallurgical & Materials Engineering department, The Maharaja Sayajirao University of Baroda. He has completed is Ph.D from IIT Bombay.
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Articles in the same Issue
- Inhalt
- Editorial
- Editorial
- Heat treatment of copper-beryllium alloy C17000 to form microstructure with high mechanical properties
- Microstructure and properties of Mg-Zn-Y-Nd-Zr alloy optimized by hot extrusion and solid solution
- Effects of modes of metal transfer on microstructure of welded duplex stainless steel samples
- Failure Analysis
- Determining the root cause of failure – calling a spade a spade – overload failures of tack strips for instrumentation wiring
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
Articles in the same Issue
- Inhalt
- Editorial
- Editorial
- Heat treatment of copper-beryllium alloy C17000 to form microstructure with high mechanical properties
- Microstructure and properties of Mg-Zn-Y-Nd-Zr alloy optimized by hot extrusion and solid solution
- Effects of modes of metal transfer on microstructure of welded duplex stainless steel samples
- Failure Analysis
- Determining the root cause of failure – calling a spade a spade – overload failures of tack strips for instrumentation wiring
- Picture of the Month
- Picture of the Month
- News
- News
- Meeting Diary
- Meeting Diary
