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Effect of N2 Addition on Microstructure and Properties of SAF 2507 Duplex Stainless Steels GTAW Welded Joint

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Abstract:

In this paper, SAF2507 duplex stainless steel (DSS) was welded by GTAW with ER2594 as filler wire, and Ar + N2 as shielding gas. The results show that, with increasing the content of N2 in the shielding gas, the amount of austenite in weld metal increase, the micro-hardness drops and impact energy increases; the use of Ar +2 ~ 3% N2 welding parameters, the microstructure and mechanical properties of welded joints are the best, the austenitic rates and impact energy of weld metals are 51%~53% and 75~88 J, respectively, and the welding process is easy to control; when the content of N2 reach 5%, the impact energy of weld metal decreases obviously and the welding arc is unstable.

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Periodical:

Materials Science Forum (Volume 724)

Pages:

127-130

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.724.127

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Online since:

June 2012

Authors:

Dong Fang Du, Jie Liu, Guo Ping Li, Jin Ming Liu

Keywords:

Austenite Phase, Gas Tungsten Arc Welding (GTAW), N2, SAF2507 DSS

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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