2019
DOI: 10.1590/s1517-707620190003.0786
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Avaliação da susceptibilidade de precipitação da fase sigma na soldagem do aço inoxidável duplex SAF2205

Abstract: RESUMO A soldagem de aços inoxidáveis duplex é uma operação crítica, devido aos ciclos térmicos aos quais o material é submetido, que podem favorecer a precipitação de fases deletérias. Nesse contexto, objetivo dessa pesquisa é analisar a influência da energia de soldagem na susceptibilidade à formação de fase sigma no aço duplex SAF2205. As chapas de SAF2205 foram soldadas pelo processo de soldagem GMAW, variando a energia de soldagem em 0,5kJ/mm, 1,0kJ/mm, 1,5 kJ/mm. O material foi analisado por microscopia … Show more

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“…In these steels, secondary phases can precipitate in temperatures ranging between 300 • C and 1000 • C, preferentially at grain boundaries, leading to embrittlement and negatively affecting their corrosion resistance [7]. One of the main deleterious phases is sigma (σ), which can reduce both the impact and corrosion resistance of duplex stainless steels, leading to as much as a 90% decrease in toughness when its quantity lies close to 4% [8][9][10].…”
Section: Introductionmentioning
confidence: 99%
“…In these steels, secondary phases can precipitate in temperatures ranging between 300 • C and 1000 • C, preferentially at grain boundaries, leading to embrittlement and negatively affecting their corrosion resistance [7]. One of the main deleterious phases is sigma (σ), which can reduce both the impact and corrosion resistance of duplex stainless steels, leading to as much as a 90% decrease in toughness when its quantity lies close to 4% [8][9][10].…”
Section: Introductionmentioning
confidence: 99%
“…At high temperatures 600-900ºC, during hot forming or welding operation, precipitation of the σ phase can occur, among others. According to FONSECA et al [6], during the duplex stainless steels welding, special care must be taken with the heat input in order to maintain the balance of the austenite and ferrite phases and prevent the precipitation of deleterious phases, especially the sigma phase. In the heating range, 350-550°C, spinodal decomposition of the ferrite phase can also occur in small precipitates of α' (rich in Cr) and α (rich in Fe) [1].…”
Section: Introductionmentioning
confidence: 99%