Effect of External Electromagnetic Fields on the Corrosion Fatigue of Welded Joints of 2205 Duplex Stainless Steel

• Published in: Materials science (New York, N.Y.) Vol. 56; no. 5; pp. 691 - 696
• Main Authors: Bilyy, O. L., González-Sánchez, J., de León Gomez, C. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2021; Springer; Springer Nature B.V
• Subjects: Alloys; Austenitic stainless steels; Body centered cubic lattice; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion; Corrosion effects; Corrosion fatigue; Corrosion resistance; Corrosion tests; Crack initiation; Crack propagation; Duplex stainless steels; Electromagnetic fields; Electromagnetic interactions; Electromagnetism; Face centered cubic lattice; Fatigue; Fatigue cracks; Fatigue testing machines; Fatigue tests; Fracture toughness; Iron compounds; Localized corrosion; Materials; Materials Science; Metal fatigue; Microstructure; Nickel; Nucleation; Pitting (corrosion); Short cracks; Solid Mechanics; Stainless steel; Steel; Structural Materials; Welded joints; Welding; corrosion fatigue; duplex steel; fracture resistance; stress intensity factor
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-021-00484-8

The 2205 duplex stainless steel (DSS) is an alloy containing 22% of Cr and 5% of Ni. The microstructure of steel is a BCC matrix of
d
-ferrite with FCC islands of
g
-austenite grains in the 50:50 ratio. DSS is used in the industry due to its high mechanical strength and corrosion resistance that are better than the corresponding characteristics of ferritic or austenitic stainless steels. In the process of welding, a low-intensity electromagnetic interaction was induced by applying axial external electromagnetic fields of 0, 3, and 12 mT. We performed the microstructural characterization and assessment of localized corrosion resistance in terms of pitting corrosion. The resistance to nucleation and growth of cracks was also evaluated for the low-cycle conditions of corrosion fatigue tests with an aim to observe the behavior of short cracks. It was found that the low-intensity electromagnetic interaction (3 mT) improves the localized corrosion resistance. However, the interaction with 12 mT revealed no improvement in this aspect as compared with 0 mT. The resistances to crack initiation and fracture toughness were also improved as a result of application of external electromagnetic fields with an intensity of 3 mT due to the modification of microstructural evolution in a thermal cycle involved in the process of welding.