Abstract:
Duplex stainless steel (DSS) consists of dual
structure, austenite and ferrite in equal proportion,
which exhibits excellent resistance to corrosion.
Various industries, i.e., pharmaceutical, marine,
petrochemicals, etc., are facing challenges in thick
section DSS welding to acquire preferred corrosion
resistance properties. The present work aims to
identify microstructure and intergranular corrosion
behavior of DSS 2205 thick plate by multipass
shielded metal arc welding using E2209 electrode.
Weldment was examined for ferrite content,
microstructure and intergranular corrosion (IGC)
behavior by cutting across the weld. Microscopic
results of weld zone revealed the presence of
Widmanstatten austenite, intergranular austenite
and grain boundary austenite, while partially
transformed austenite was noticed at heat-affected
zone. Degree of sensitization (DOS) at three
distinguished weldment zones has been identified
by electrochemical potentiokinetic reactivation test
and found in good agreement with the standard and
finding of more susceptibility of IGC in higher
ferrite zone.
Description:
The authors would like to express their gratitude
toward Mr. Chandreshbhai Makadia, Vice President
of GMM Pfaudler, Vallabh Vidhyanagar, for their
support and granting permission to utilize welding
facility and other resources.
