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Effects of TIG Reheating on Duplex Stainless Steel Weld Microstructure

Varbai, B. and Tolnai, F. and Májlinger, K. (2019) Effects of TIG Reheating on Duplex Stainless Steel Weld Microstructure. International Journal of Engineering and Management Sciences (IJEMS), 4 (1). pp. 295-302. ISSN 2498-700X

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Abstract

Duplex stainless steels (DSS) gaining their excellent mechanical properties and corrosion resistance due to their austenitic-ferritic microstructure, ideally in the same amount. However, to keep this ideal phase ratio during arc welding is very difficult. Generally, the arc welding processes will result in more ferritic microstructure in the weld metal and in the heat affected zone, due to the rapid cooling. The ferritic microstructure can cause chromium-nitride precipitation, because the nitrogen solubility in ferrite phase is very low below 700 °C. These chromium-nitride precipitations can cause loss of corrosion resistance and mechanical properties. However, during sub-sequent reheating, the chromium-nitrides can dissolve and act as a secondary austenite nucleation site in the ferritic microstructure. In our research we welded DSS specimen autogenously, with tungsten inert gas welding using pure argon and 94 % argon + 6 % nitrogen as shielding gasses. In the first case the sub-sequent solid-state reheating caused 20 % increase in the austenite fraction of the weld metal but with the use of mixed shielding gas only 5 % increase.

Item Type: Article
Subjects: T Technology / alkalmazott, műszaki tudományok > TJ Mechanical engineering and machinery / gépészmérnöki tudományok
Depositing User: Dr. Kornél Májlinger
Date Deposited: 16 Jul 2019 09:09
Last Modified: 05 Apr 2023 08:04
URI: http://real.mtak.hu/id/eprint/94418

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