Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

JUNE 28 WEDNESDAY AFTERNOON
JS1-WeA-P.1 γ N -SHIFTING AS A FUNCTION OF N 2 CONTENT IN AISI 304 NI-
TRIDING. R. Valencia-Alvarado a , A. de la Piedad-Beneitez , J. de la Rosa-Vázquez , R. López-
Callejas , S. R. Barocio , O. G. Godoy-Cabrera , A. Mercado-Cabrera , R. Peña-Eguiluz and A.
E. Muñoz-Castro. Instituto Nacional de Investigaciones Nucleares, Plasma Physics Laboratory, A
P. 18-1027, 11801 México, D.F. Instituto Tecnológico de Toluca, AP 890, Toluca, México. Instituto
Politécnico Nacional, ESIME, 07738, México, D.F. a E-mail: rva@nuclear.inin.mx
We present in this work some experimental results obtained from nitriding AISI 304 stainless steel at
different temperatures by means of RF/DC generated 10 15 -10 16 m -3 density plasmas in the 1-4 eV
temperature range. The samples were biased up to –500 V. Substrate temperatures proof to be an
influential factor in the diffusion of the impinging ions into the material under treatment. In turn,
this temperature during the expanded γ N shift, is a function of the amount of nitrogen introduced to
the sample given by the bias, the depth of the nitrided layer and the plasma characteristics. Thus, we
have chosen the substrate temperature as a global control variable in order to analyze the evolution
of the nitrogen enrichment process through its influence on the X ray diffraction imaging of the γ N
shift in the samples. The optimization of the temperature is explored along with its limits in terms of
the Cr precipitation threshold.
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