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
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Materials Research
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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.
Como referenciar
BETINI, EVANDRO G.; GOMES, MAURILIO P.; MUCSI, CRISTIANO S.; ORLANDO, MARCOS T.D.; LUZ, TEMISTOCLES de S.; AVETTAND-FENOEL, MARIE-NOELLE; ROSSI, JESUALDO L. 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. Materials Research, v. 22, p. 1-9, 2019. 1. DOI: 10.1590/1980-5373-MR-2019-0247. Disponível em: http://repositorio.ipen.br/handle/123456789/30422. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.