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Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

Role of plasma nitriding temperature and time in the corrosion behaviour and microstructure evolution of 15-5 PH stainless steel

2010; Volume: 48; Issue: 2 Linguagem: Inglês

10.4149/km_2010_2_105

ISSN

1338-4252

Autores

Euclides Alexandre Bernardelli, Paulo César Borges, Luís César Fontana,

Tópico(s)

Welding Techniques and Residual Stresses

Resumo

Simultaneous plasma nitriding and ageing were performed on 15-5 PH stainless steel, being the treatment time (2, 4 and 6 h) and temperature (390, 440 and 490 • C) the control variables.The highest value for core hardness was obtained at the longest time (6 h) and the lowest temperature (390 • C).A long treatment time (6 h) and high temperature (490 • C) have favoured the surface layer formation.The formation of expanded martensite αN and expanded austenite γN was observed using low nitriding temperature, while raising the temperature favoured the formation of the γ and CrN phases.When the treatment was carried out at temperatures of 440 and 490 • C, a drop in the corrosion resistance was observed.Treatment at 390 • C led to an improvement in the corrosion potential (EI=0), however, the samples processed at 390 • C did not show a clear passive region.K e y w o r d s : plasma nitriding, ageing, 15-5 PH stainless steel, phase formation, corrosion

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