Title :

Effect of Nitrogen Addition to Shielding Gas on Cooling Rates and in the Microstructure of Thin Sheets of Duplex Stainless Steel Welded by Pulsed Gas Tungsten Arc Welding Process

Author(s) :

Betini, Evandro Giuseppe [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]
Gomes, Maurilio Pereira [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]
Mucsi, Cristiano Stefano [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]
Orlando, Marcos Tadeu D’Azeredo [Auteur]
Federal University of Espírito Santo
Luz, Temístocles de Sousa [Auteur]
Federal University of Espírito Santo
Avettand-Fènoël, Marie-NoËlle [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Rossi, Jesualdo Luiz [Auteur]
Instituto de Pesquisas Energéticas e Nucleares [São Paulo] [IPEN/CNEN-SP]

Journal title :

Materials Research

Abbreviated title :

Mat. Res.

Volume number :

22

Publisher :

FapUNIFESP (SciELO)

Publication date :

2019-08-26

English keyword(s) :

Duplex stainless steel
cooling rates
nitrogen
GTAW
thermal cycle
microhardness

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

The effect of the nitrogen content in the shielding gas and its effect on temperature distributions at the welded zone of thin sheets of duplex stainless steel have been evaluated. The duplex stainless steels have many ...
Show more >The effect of the nitrogen content in the shielding gas and its effect on temperature distributions at the welded zone of thin sheets of duplex stainless steel have been evaluated. The duplex stainless steels have many features due to unique microstructural combination of austenite and ferrite grains. The phase balance can be easily shifted depending on the welding parameters. Two sheets were welded using pure argon and pure argon plus 2% of nitrogen as shielding gas. The thermal profile had shown that N2-supplemented shielding gas lead to higher peaks of temperature using similar welding parameters. Microstructural examination showed that the austenite phase in the weld increased with the presence of nitrogen in the shielding gas. The added nitrogen promoted primary austenite formation and slightly increases the microhardness at the solidified zone. Microhardness mapping and metallographic imaging presented information about microstructures, confirming the formation of secondary phases during thermal cycle in the temperature range 850 °C and 950 °C. Control of ferrite amounts in the welds is essential mainly to improve mechanical properties and corrosion resistance of welding zones.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2021-04-12T16:16:26Z
2021-04-15T12:52:59Z