Abstract
To investigate the influence of post-weld heat treatment on the microstructure and corrosion properties of super duplex stainless steel welded joints, multi-layer multi-pass welding of 2507 super duplex stainless steel by tungsten argon arc welding was performed using an ER2594 welding wire. The microstructures of the welded joints before and after post-weld heat treatment at 1150 °C, 1170 °C and 1190 °C were observed, and the mechanical and corrosion properties were tested. The post-weld heat treatment changed the austenite content and morphology of the welded joint and improved the corrosion resistance of different parts of the weld metal. The choice of various solution heat treatment temperatures affected the change in austenite content in the weld zone and the degree of diffusion and homogenization of the alloy elements. After post-weld heat treatment at 1170 °C, the two-phase ratios in each area of the weld were the most suitable and uniform, and the overall mechanical and corrosion properties of the joint were more uniform.
Funding statement: This work was supported by the National Natural Science Foundation of China, Grant number 51575382, and Marine Economic Innovation and Development of Regional Demonstration Projects of China, Grant number BHSF 2017-22.
About the authors
Tian Lei, born in 1984, has been studying for a Doctorate in Material Processing Engineering at Tianjin University from 2020 to now, and works in Offshore Oil Engineering Co., Ltd. His main research field is reliability evaluation of welded structures.
Zhanqi Gao graduated from Tianjin University with a Master’s degree in 2019. His main research field is duplex stainless steel welding.
Assoc. Prof. Dr. Yongdian Han, born in 1983, is Associate Professor at Tianjin University, Tianjin, China. His research focuses on electronic packaging, welding structure and corrosion.
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