Grazing incidence synchrotron X-ray difraction and Mössbauer spectroscopy analyses of plasma nitrided ASTM F138 stainless steel
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2016
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BRAZILIAN MRS MEETING, 15th
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A systematic investigation of samples of plasma-nitriding austenitic stainless
steels ASTM F138 and AISI 316L is reported. The surface treatment of the steels
through plasma-nitriding was used to improve further the hardness, wear and
corrosion resistance of these stainless steels. The resulting layered
crystallographic structure actually corresponds to several phases with close cell
parameters, making their identification and quantification a real experimental
challenge. The ASTM F138 and AISI 316L stainless steel disks were plasmanitrided
for 4 h at 400 ºC in a 80% H2 -20% N2 atmosphere at 6 torr, using plasma
current frequencies between 6 and 100 kHz. Data of Mössbauer (CEMS and
CXMS) and grazing incidence synchrotron X-ray diffraction (XRD-SR) were
systematically collected. The nitrided layer thickness were not in general
influenced by the plasma frequency, except at 12 kHz, which produced a layer
thickness of approximately 8.0 mm, being in average 40% thicker than for the
other samples. CXMS and CEMS Mössbauer spectra for this 12 kHz-sample show
a much more pronounced magnetic resonance lines than for the other samples.
The Fe4N phase presents a single magnetic hyperfine interaction; the other two
(Fe2-3N and the expanded austenite) present both paramagnetic and magnetic
components, even though their hyperfine parameters may not be safely
separated. We also present the results of XRD-SR that were probed at several
depths. The data from these techniques may be consistently correlated and this
leads to an improved model to explain the structure of the nitrided layers.
Como referenciar
SOUZA, DANILO O.D. de; SILVA, EDILAINE H.; OLZON-DIONYSIO, MARISTELA; SOUZA, SYLVIO D. de; MARTINEZ, L.G.; FABRIS, JOSE D.; ARDISSON, JOSE D. Grazing incidence synchrotron X-ray difraction and Mössbauer spectroscopy analyses of plasma nitrided ASTM F138 stainless steel. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 935-935. Disponível em: http://repositorio.ipen.br/handle/123456789/27423. Acesso em: 25 Apr 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.