Effect of nitrogen addition to shielding gas on cooling rates and microstructure of thin plates of duplex stainless steel welded by pulsed GTAW process
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Data
Data de publicação:
2018
Autores IPEN
JESUALDO LUIZ ROSSI
CRISTIANO STEFANO MUCSI
MAURILIO PEREIRA GOMES
EVANDRO GIUSEPPE BETINI
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
The content of nitrogen to shielding gas and their effects on temperature distributions
of the heat-affected zone of thin plates of duplex stainless steel during the pulsed
GTAW process has been studied here. The duplex stainless steels have many features
due to unique structural combination of austenite and ferrite grains. The phase balance
can be easily altered to a mostly ferritic microstructures, depending on the welding
parameters like shielding gas used. Microstructural examination showed that the
austenite phase in the weld increases with the presence of nitrogen in the shielding
gas. The additional nitrogen promoted the primary austenite formation and slightly
increased the microhardness of the solidified zone. Microhardness mapping and
metallographic imaging presented information about microstructures, confirming the
formation of secondary phases and microstructure sensitization during thermal cycle
in the temperature range 850-950°C. Two plates 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 high peaks of temperature using similar
welding parameters. The columnar and equiaxied ferrite grain size of solidified fusion
zone was studied. Ferrite phase increased from 53 % in base metal to 78% to pure Ar
and 63% using Ar+2%N2 as shielding gas. Control of ferrite in the welds is essential
mainly to improve corrosion resistance.
Como referenciar
BETINI, E.G.; GOMES, M.P.; MUCSI, C.S.; ORLANDO, M.T.; LUZ, T.S.; AVETTAND-FENOEL, M.; ROSSI, J.L. Effect of nitrogen addition to shielding gas on cooling rates and microstructure of thin plates of duplex stainless steel welded by pulsed GTAW process. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 4811-4811. Disponível em: http://repositorio.ipen.br/handle/123456789/29557. Acesso em: 15 Jun 2024.
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.