Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

1 Publication
Nitrogen diffusion in single crystalline austenitic stainless steel: ion energy and flux effects
Martinavičius, A.; Abrasonis, G.; Möller, W.; Chumlyakov, Y.;
Nitrogen diffusion in single crystalline austenitic stainless steel during ion beam nitriding is investigated. Single crystalline AISI 316L austenitic stainless steel (ASS) with orientation (001) has been ion beam nitrided at 400 °C using a Kaufman-type ion source. The acceleration voltage has been varied from 450 to 1200 eV, and the current density from 0.3 to 0.7 mA cm−2. XRD analysis shows the presence of the phase usually called “expanded” austenite or γN phase. The nitrogen depth profiles have been determined using nuclear reaction analysis (NRA). The profiles of nitrided samples can be depicted by an initial quasi-linear decrease followed by a sharp leading edge. The nitrogen penetration depth is significantly higher for higher implantation energies as well as for higher current densities. The result cannot be explained by the difference of the sputtering rate.
The “trapping-detrapping” model, which is able to reproduce the full shape of the nitrogen depth, has been used to fit nitrogen depth profiles and extract the diffusion coefficient values. The nitrogen profile fitting shows that the nitrogen diffusion coefficient strongly depends on irradiation flux and ion energy during ion beam nitriding, confirming the tendencies deduced directly from the nitrogen distribution profiles.
  • Lecture (Conference)
    22nd International Conference on Surface Modification Technologies - SMT22, 24.09.2008, Trollhättan, Sweden

Publ.-Id: 11967 - Permalink