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Influence of welding thermal cycles on microstructure and pitting corrosion resistance of 2304 duplex stainless steels
Authors:Hua Tan  Zhiyu Wang  Yiming Jiang  Yanze Yang  Bo Deng  Hongmei Song  Jin Li
Affiliation:1. Department of Materials Science, Fudan University, Shanghai 200433, PR China;2. Research and Development Center, Baosteel Co., Ltd., Shanghai 201900, PR China
Abstract:Different welding thermal cycles from single-pass to triple-pass were performed on two kinds of 2304 duplex stainless steel through Gleebe thermal–mechanical simulator. The corresponding microstructure was observed, while the pitting corrosion resistance was investigated in 1.0 M NaCl by potentiostatic critical pitting temperature (CPT). The results showed that single-pass welding deteriorated microstructure and pitting corrosion resistance significantly. As the welding pass increased, the ferrite content decreased and CPT increased. However, CPT was still lower than that of the base metal. Nitride precipitated at the boundary between ferrite and austenite phase for low-alloyed 2304 after the single-pass welding thermal cycle.
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