Effect of nitrogen protection on weld metal microstructure and intergranular behavior of S32101 duplex stainless steel 15 m water depth hyperbaric laser underwater welding

In this study, 16-mm-thick S32101 duplex stainless steel were welded using hyperbaric underwater laser welding system in 0.15 MPa. The misorientation angle distribution of grain boundaries in the weld metal was analyzed using the electron backscatter diffraction technique. The ionic currents near th...

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Bibliographic Details
Published in:Advances in mechanical engineering 2022-01, Vol.14 (1)
Main Authors: Wang, Kai, Jiao, Xiangdong, Zhu, Jialei, Shao, Changlei, Li, Congwei
Format: Article
Language:English
Subjects:
Austenite
Corrosion
Corrosion currents
Corrosion resistance
Duplex stainless steels
Electron backscatter diffraction
Grain boundaries
Intergranular corrosion
Laser beam welding
Metallography
Misalignment
Stainless steel
Underwater welding
Water depth
Weld metal
Welded joints
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Summary:In this study, 16-mm-thick S32101 duplex stainless steel were welded using hyperbaric underwater laser welding system in 0.15 MPa. The misorientation angle distribution of grain boundaries in the weld metal was analyzed using the electron backscatter diffraction technique. The ionic currents near the surface of metallography were measured by the Scanning Vibrating Electrode Technique (SVET) and performed to evaluate the intergranular corrosion (IGC) resistance based on corrosion current density. The volume fractions of ferrite and austenite and the grain boundary misorientation angle affect the IGC sensitivity of the welded joints. The relationship between the grain boundary misorientation angle of the austenite and corrosion resistance was analyzed. When the weld metal was shielded with nitrogen, and the volume fraction of austenite and the frequency of Σ3 coincidence site lattice boundary in the weld was increased. The misorientation angle distribution in the austenite and the frequency of Σ3 coincidence site lattice boundary influence the IGC resistance of the welded joints.
ISSN:1687-8132
1687-8140
DOI:10.1177/16878140211072943