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Pulsed-plasma-nitrided API 5L X-65 steel: hydrogen permeability and microstructural aspects

1998; Institute of Physics; Volume: 31; Issue: 24 Linguagem: Inglês

10.1088/0022-3727/31/24/010

1361-6463

Andreas Bott, Sonia Patricia Brühl, B J Gómez, M.A. Zampronio, P. Miranda, J. Feugeas,

Diamond and Carbon-based Materials Research

Nitriding of an API 5L X-65 steel was performed using a low-frequency dc pulsed-plasma technique. A 6 h treatment was found to produce a compact surface nitride layer composed of and nitrides with a thickness of around . The plasma-nitriding treatment resulted in a significant reduction in hydrogen permeability, from (for the untreated steel) to for electrolytic hydrogen charging via the nitrided surface. When the sample was oriented with the nitrided surface as the hydrogen-exit face, the permeability was reduced even further, to .