Phase Transformation and Mechanical Behavior in Annealed Duplex Stainless Steel Welds

Âpreferential precipitation sites.
The gas tungston arc welding (GTAW)isTo prevent this the process is carried out above
employed for welding of thin plates.In GTAW of1050°C.Above 1050 °C, the volume
standard 2205 duplex stainless steel ( DSS) platefraction of ? ferrite increases with annealing
of 5 mm thickness, which is having 22.37% Crtemperature. The increase of ? ferrite occurs at a
and 5.74% Ni is used in this study. Weld beadsfaster rate in the HAZ than in the base metal and
were produced with ER 2209 filler wire of higherfusion zone. Optimal mechanical properties and an
alloy content (22% Cr and 9% Ni). The shieldingacceptable ferrite/ austenite ratio throughout the
gas Argon was employed in this work. Theweld regions corresponds to annealing at 1050
interpass temperatures were kept as 1100 C.°C.
The phase transformations and mechanicalThe main aim of this work is to investigate the
behaviour during welding and subsequent.Annealingdefect in the weldment by the use of x-ray
treatment of 2205 duplex stainless steel have(NDT). The macro and microstructure
been investigated. Detailed microstructuralexaminations, as well as the evaluations of the
examination showed the presence of highermechanical properties such as impact and
ferrite amounts in the heat affected zone (HAZ),hardness were carried out. And also the pitting
while higher amounts of austenite were recordedcorrosion resistances were evaluated. Results are
in the centre region of the weld metal. Generalydiscussed in detail.
Annealing treatments in the temperature range ofÂ
800-1000 °C resulted in a precipitation of ?Keywords: DSS, GTAW, weld defect, macro and
phase and chromium carbides at the austenite andmicrostructure, mechanical properties, pitting
ferrite (?/?) interfaces that were found to becorrosion.