Assessment of Stress Corrosion Cracking Resistance of Activated Tungsten Inert Gas-Welded Duplex Stainless Steel Joints

Journal Article · Fri Dec 15 04:00:00 EST 2017 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-017-3057-0· OSTI ID:22860724

The stress corrosion cracking behavior of duplex stainless steel (DSS) weld joint largely depends on the ferrite-austenite phase microstructure balance. This phase balance is decided by the welding process used, heat input, welding conditions and the weld metal chemistry. In this investigation, the influence of activated tungsten inert gas (ATIG) and tungsten inert gas (TIG) welding processes on the stress corrosion cracking (SCC) resistance of DSS joints was evaluated and compared. Boiling magnesium chloride (45 wt.%) environment maintained at 155 °C was used. The microstructure and ferrite content of different weld zones are correlated with the outcome of sustained load, SCC test. Irrespective of the welding processes used, SCC resistance of weld joints was inferior to that of the base metal. However, ATIG weld joint exhibited superior resistance to SCC than the TIG weld joint. The crack initiation and final failure were in the weld metal for the ATIG weld joint; they were in the heat-affected zone for the TIG weld joint.

• OSTI ID: 22860724
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 12 Vol. 26; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKING
FERRITE
GAS TUNGSTEN-ARC WELDING
HEAT AFFECTED ZONE
MAGNESIUM CHLORIDES
MICROSTRUCTURE
STAINLESS STEELS
STRESS CORROSION
WELDED JOINTS