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Open AccessArticle

Microstructural, Mechanical, and Electrochemical Analysis of Duplex and Superduplex Stainless Steels Welded with the Autogenous TIG Process Using Different Heat Input

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Graduate Program on Metallurgical Engineering, Federal Fluminense University, Avenida dos Trabalhadores, 420, Vila Santa Cecília, 27255-125 Volta Redonda, Rio de Janeiro, Brazil
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Mechanical Engineer Department-UniFOA, Avenida. Paulo Erlei. Alves. Abrantes, 1325, Três Poços, 27240-560 Volta Redonda, Rio de Janeiro, Brazil
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Author to whom correspondence should be addressed.
Metals 2017, 7(12), 538; https://doi.org/10.3390/met7120538
Received: 1 November 2017 / Revised: 23 November 2017 / Accepted: 27 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Physical Metallurgy of High Performance Steels)
Duplex Stainless Steels (DSS) and Superduplex Stainless Steels (SDSS) have a strong appeal in the petrochemical industry. These steels have excellent properties, such as corrosion resistance and good toughness besides good weldability. Welding techniques take into account the loss of alloying elements during the process, so this loss is usually compensated by the addition of a filler metal rich in alloying elements. A possible problem would be during the welding of these materials in adverse conditions in service, where the operator could have difficulties in welding with the filler metal. Therefore, in this work, two DSS and one SDSS were welded, by autogenous Tungsten Inert Gas (TIG), i.e., without addition of a filler metal, by three different heat inputs. After welding, microstructural, mechanical, and electrochemical analysis was performed. The microstructures were characterized for each welding condition, with the aid of optical microscopy (OM). Vickers hardness, Charpy-V, and cyclic polarization tests were also performed. After the electrochemical tests, the samples were analyzed by scanning electron microscopy (SEM). The SDSS welded with high heat input kept the balance of the austenite and ferrite, and toughness above the limit value. The hardness values remain constant in the weld regions and SDSS is the most resistant to corrosion. View Full-Text
Keywords: duplex stainless steel; superduplex stainless steel; heat input; autogenously TIG duplex stainless steel; superduplex stainless steel; heat input; autogenously TIG
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MDPI and ACS Style

Da Fonseca, G.S.; Barbosa, L.O.R.; Ferreira, E.A.; Xavier, C.R.; De Castro, J.A. Microstructural, Mechanical, and Electrochemical Analysis of Duplex and Superduplex Stainless Steels Welded with the Autogenous TIG Process Using Different Heat Input. Metals 2017, 7, 538.

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