Influence of filler metal on the microstructure of dissimilar welds between UNS S32205 duplex stainless steel and ASTM A517 Quench and tempered steel

Document Type : Research Paper

Authors

• A.R Forough
• M Shamanian
• M Kasiri

Abstract

In this study, the microstructure in different regions of dissimilar welding sections of type 2205 duplex stainless steel (DSS) to type A517 high-strength quenched and tempered (QTLA) steel was investigated using optical microscopy (OM) and scanning electron microscopy (SEM). The joints were fabricated using gas tungsten arc welding by two types of filler metals including ER309LMo and ER2209. The metallographic analysis and X-ray diffraction (XRD) revealed that the weld metals were completely free of common destructive phases and no trace of sigma phase and chromium nitride was found. The ER309LMo weld metal has austenitic with lathy ferrite microstructure and ER2209 weld metal sample has an austenitic continues networks in the matrix of primary ferrite. The studies by SEM from joint interface of A517 side revealed, in both welding samples, the unmixed zone formed and in the case of ER309LMo addition to this zone, a decarburization layer is also visible. HAZ of 2205 steel is non-width and with coarse primary ferrite grains and this region in A517 steel side has been width and with not-tempered martensite microstructure.The ER309LMo and ER2209 weld metal’s hardness respectively were about 240 and 300 vickers.

Keywords

• Duplex stainless steel
• Low alloy quench and tempered steel
• Gas tungsten arc welding
• Scanning electron microscopy

20.1001.1.22285946.1396.8.30.10.1

---

References

1- Y. Jiang, H. Tan, Z. Wang, J. Hong, L. Jiang, J. Li, "Influence of Creq/Nieq on pitting corrosion resistance and mechanical properties of UNS S32304 duplex stainless steel welded joints", Corrosion Science, Vol.70, pp. 252-259, 2013.

 2- J. Luo, Y. Dong, L. Li, X. Wang, " Microstructure of 2205 duplex stainless steel joint in submerged arc welding by post weld heat treatment", Journal of Manufacturing Processes, Vol.16, pp. 144-148, 2014.

 3- 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", Materials Science and Engineering A, Vol. 358, pp. 9-16, 2003.

 4- S. Wang, Q. Ma, Y. Li, "Characterization of microstructure, mechanical properties and corrosion resistance of dissimilar welded joint between 2205 duplex stainless steel and 16MnR", Materials and Design, Vol. 32,pp. 831-837, 2011.

 5- S. Wang, P. Chiu, J. Yang, J. Fang, " Gamma phase transformation in pulsed GTAW weld metal of duplex stainless steel"Materials Science and Engineering A, Vol.420, pp. 26-33, 2006.

 6- 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", Materials and Design, Vol. 27, pp. 182-191, 2006.

 7 -م. رحمانی، م. شمعانیان و م. کثیری " بررسی ریزساختار و خواص مکانیکی جوش­های نامشابه فولاد زنگ نزن سوپردوفازی 32750S UNSبه فولاد زنگ نزن آستنیتی L304AISI  "، مجله مواد نوین مرودشت، جلد سوم، شماره دوم، 1391.

 8- M. Sadeghian, M. Shamanian, A. Shafyei, " Effect of heat input on microstructure and mechanical properties of dissimilar joints between super duplex stainless steel and high strength low alloy steel", Materials and Design, 2014.

 9- ASME, Boiler and Pressure Vessel Code, Sec IX, Welding and BRAZING Qualifications, The American Society of Mechanical Engineers, 2007.                                                                                  

10- J. C. Lippold and D. J. Kotecki, "Welding Metallurgy and Weldability of Stainless Steels", JohnWiley & Sons Inc., New Jersey, USA, 2005.

 11- Materials Welding Handbook Vol. 1, Welding Technology. American Welding Society, 2000.

 12- H. Sieurin, R. Sandstrom, " Austenite reformation in the heat-affected zone of duplex stainless steel 2205", Materials Science and Engineering A, Vol.418, pp. 250-256, 2006.

 13- A. Eghlimi, M. Shamanian, M. Eskandarian, A. Zabolian, M. Nezakat, "Evaluation of microstructure and texture across the welded interface of super duplex stainless steel and high strength low alloy steel", Surface & Coatings Technology, Vol. 264, pp. 150-162, 2015.

14- ASM metals handbook, "Welding, Brazing and Soldering", vol. 6, 2005.

 15- S. Kou, "Welding Metallurgy", 2nd Ed., Wiley-Interscience, New Jersey, The United States of America,2003.

 16- A-H.I. Mourad, A. Khourshid, T. Sharef, "Gas tungsten arc and laser beam welding processes effects on duplex stainless steel 2205 properties", Materials Science and Engineering A, Vol. 549, pp.105-113, 2012.