Abstract:
This study analyzed the integrity of welded joints of a UNS S32205 duplex stainless steel, using different welding energies: 0.5 kJ.mm-1, 1.0 kJ.mm-1, and 3.5 kJ.mm-1. Microstructural characterization, tensile testing, intergranular attack susceptibility testing (ASTM A262 practice A) and pitting and crevice corrosion resistance tests (critical pitting temperature test, ASTM G48 practice C) were performed in these welded joints. The results showed that the tensile properties of the welded joints did not vary significantly with the welding energy. The ferrite content in the molten zone (MZ) of the microstructure was proportional to the welding energy: the ferrite concentration in the 0.5 kJ.mm-1 welding was approximately 75 %. When the welding energy increased to 3.5 kJ.mm-1, the amount of ferrite dropped to 54 %. Metallographic examinations of the heat-affected zone (HAZ) of the 0.5 kJ.mm-1 and 1.0 kJ.mm-1 joints showed signs of microsegregation due to the elevated welding-process temperature, which caused the partial dissolution of the austenite. The 3.5 kJ.mm-1 welded joint featured comparatively higher proportion of austenite grains, which were coarser. The HAZ of the 3.5 kJ.mm-1 welded joint was comparatively more susceptible to the intergranular attack along the interfaces, while in base metal and the other two joints, the intergranular attack was more homogeneous. The corrosion susceptibility of the welded joints indicated that all welding conditions suffered pitting corrosion in the ferritic phase.
Reference:
PEREIRA, Henrique Boschetti; PIMENTEL, Tarcisio Henrique Carvalhaes; SILVA, Carlos Alberto da; PANOSSIAN, Zehbour; AZEVEDO, Cesar Roberto de Farias. Influence of welding energy on intergranular and pitting corrosion susceptibility of UNS S32205 duplex stainless-stell joints. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. (on-line). Proceedings… 17 p.
Document is password protected, ask Customer Service/Library-DAIT/IPT. Log into BiblioInfo Biblioteca-DAIT/IPT to access the text in PDF:
https://escriba.ipt.br/pdf_restrito/177431.pdf
This study analyzed the integrity of welded joints of a UNS S32205 duplex stainless steel, using different welding energies: 0.5 kJ.mm-1, 1.0 kJ.mm-1, and 3.5 kJ.mm-1. Microstructural characterization, tensile testing, intergranular attack susceptibility testing (ASTM A262 practice A) and pitting and crevice corrosion resistance tests (critical pitting temperature test, ASTM G48 practice C) were performed in these welded joints. The results showed that the tensile properties of the welded joints did not vary significantly with the welding energy. The ferrite content in the molten zone (MZ) of the microstructure was proportional to the welding energy: the ferrite concentration in the 0.5 kJ.mm-1 welding was approximately 75 %. When the welding energy increased to 3.5 kJ.mm-1, the amount of ferrite dropped to 54 %. Metallographic examinations of the heat-affected zone (HAZ) of the 0.5 kJ.mm-1 and 1.0 kJ.mm-1 joints showed signs of microsegregation due to the elevated welding-process temperature, which caused the partial dissolution of the austenite. The 3.5 kJ.mm-1 welded joint featured comparatively higher proportion of austenite grains, which were coarser. The HAZ of the 3.5 kJ.mm-1 welded joint was comparatively more susceptible to the intergranular attack along the interfaces, while in base metal and the other two joints, the intergranular attack was more homogeneous. The corrosion susceptibility of the welded joints indicated that all welding conditions suffered pitting corrosion in the ferritic phase.
Reference:
PEREIRA, Henrique Boschetti; PIMENTEL, Tarcisio Henrique Carvalhaes; SILVA, Carlos Alberto da; PANOSSIAN, Zehbour; AZEVEDO, Cesar Roberto de Farias. Influence of welding energy on intergranular and pitting corrosion susceptibility of UNS S32205 duplex stainless-stell joints. In: INTERNATIONAL CORROSION CONGRESS, 21., AND THE INTERNATIONAL CORROSION MEETING, 8., 2021, São Paulo. (on-line). Proceedings… 17 p.
Document is password protected, ask Customer Service/Library-DAIT/IPT. Log into BiblioInfo Biblioteca-DAIT/IPT to access the text in PDF:
https://escriba.ipt.br/pdf_restrito/177431.pdf
