Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 256, Issue -, Pages 254-261Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.02.019
Keywords
Keyhole deep penetration tungsten inert gas (DP-TIG) welding; Duplex stainless steel (DSS); Microstructure; Grain boundary misorientation angle distribution; Intergranular corrosion
Funding
- Science and Technology Planning Project of Guangdong Province [2015B010919005]
- Science and Technology Planning Project of Guangzhou City [201604046026]
- National Natural Science Foundation of China [51374111]
- China Scholarship Council [201606155058]
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In this study, 10.8-mm-thick workpieces of S32101 duplex stainless steel were welded using a keyhole deep penetration tungsten inert gas welding system. The misorientation angle distribution of grain boundaries in the heat affected zone was analyzed using the electron backscatter diffraction technique. Double-loop electro-chemical potentiokinetic reactivation tests were performed to assess the intergranular corrosion resistance, based on the degree of sensitization. The volume fractions of ferrite and austenite and the grain boundary misorientation angle affect the intergranular corrosion of the welded joints. The relationship between the grain boundary misorientation angle of the austenite and the degree of sensitization was established. The volume fraction of austenite and the frequency of Sigma 3 coincidence site lattice boundary, increases with the increasing heat input. The misorientation angle distribution in the austenite, the frequency of Sigma 3 coincidence site lattice boundary, and the volume fraction of CrN influence the intergranular corrosion resistance of the heat affected zone.
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