Microstructure and Corrosion Resistance of Dissimilar Welded Joints between Duplex Stainless Steel and Austenitic Stainless Steel

Abstract:

The dissimilar metals components of duplex stainless steels are more and more used in engineering fields recently. But the welding of dissimilar metals is more a challenge than that of similar metals. The joints of dissimilar metals between 2205 duplex stainless steel and 304 austenitic stainless steel were produced by tungsten inert gas arc welding (GTAW) with welding wire ER2209 and ER309, respectively. The microstructural characterization of welded joints is systematically analyzed by using optical microscope and X-ray diffractometer. The pitting corrosion resistance of the joints is evaluated by electrochemical test. Results show that the microstructure of joint consists of austenite and ferrite, and no detrimental phases precipitate in the weldment. The biphase ratio of austenite (γ) / ferrite (α) is adequate both in weld metal and heat-affected zone (HAZ), which is advantageous to the performance of welded joints. The weld metals have relatively lower pitting corrosion resistance compared with the 2205 base metal, and the pitting corrosion resistance of the joint produced with ER2209 is better than that of the joint with ER309 in chloride solution.

• Periodical: Advanced Materials Research (Volume 570)
• Pages: 43-51
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.570.43
• Online since: September 2012
• Authors: Shao Gang Wang, Yan Li, Wei Guo Zhai
• Keywords: Corrosion Resistance, Dissimilar Metal, Duplex Stainless Steel, Microstructure, Welded Joint

References

[1] Zh.L. Jiang, X.Y. Chen, H. Huang, X.Y. Liu, Grain refinement of Cr25Ni5Mo1. 5 duplex stainless steel by heat treatment, Mater. Sci. Eng. A. 363(2003)263-267.

DOI: 10.1016/s0921-5093(03)00647-6

[2] V. Muthupandi, P. Bala Srinivasan, S.K. Seshadri, S. Sundaresan, Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds, Mater. Sci. Eng. A. 358(2003)9-16.

DOI: 10.1016/s0921-5093(03)00077-7

[3] B. Kurt, The interface morphology of diffusion bonded dissimilar stainless steel and medium carbon steel couples, J. Mater. Process. Technol. 190(2007)138-141.

DOI: 10.1016/j.jmatprotec.2007.03.063

[4] A. Ureña, E. Otero, M.V. Utrilla, C.J. Múnez, Weldability of a 2205 duplex stainless steel using plasma arc welding, J. Mater. Process. Technol. 182(2007)624-631.

DOI: 10.1016/j.jmatprotec.2006.08.030

[5] P. Bala Srinivasan, V. Muthupandi, W. Dietzel, V. Sivan, An assessment of impact strength and corrosion behaviour of shielded metal arc welded dissimilar weldments between UNS 31803 and IS 2062 steels, Mater. Des. 27(2006)182-191.

DOI: 10.1016/j.matdes.2004.10.019

[6] S.G. Wang, Q.H. Ma, Y. Li, Characterization of microstructure, mechanical properties and corrosion resistance of dissimilar welded joint between 2205 duplex stainless steel and 16MnR, Mater. Des. 32(2011)831-837.

DOI: 10.1016/j.matdes.2010.07.012

[7] M. Sireesha, V. Shankar, K. Albert Shaju, S. Sundaresan, Microstructural features of dissimilar welds between 316LN austenitic stainless steel and alloy 800, Mater. Sci. Eng. A. 292(2000)74-82.

DOI: 10.1016/s0921-5093(00)00969-2

[8] V. Muthupandi, P. Bala Srinivasan, S.K. Seshadri, S. Sundaresan, Corrosion behaviour of duplex stainless steel weld metals with nitrogen additions, Corros. Eng., Sci. Technol. 38(2003)303-308.

DOI: 10.1179/147842203225008895

[9] S.A. Al-Fozan, A.U. Malik, Effect of seawater level on corrosion behavior of different alloys, Desalination. 228(2008)61-67.

DOI: 10.1016/j.desal.2007.08.007

[10] P.Q. Zhang, J.X. Wu, W.Q. Zhang, X.Y. Lu, K. Wang, A pitting mechanism for passive 304 stainless steel in sulphuric acid media containing chloride ions, Corros. Sci. 34(1993)1343-1354.

DOI: 10.1016/0010-938x(93)90091-t