Christiansen, Thomas Lundin1; Drouet, M.3; Martinavičius, A.4; Somers, Marcel A. J.5
1 Department of Mechanical Engineering, Technical University of Denmark2 Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark3 Université de Poitiers4 Helmholtz-Zentrum Dresden-Rossendorf5 Centre for oil and gas – DTU, Center, Technical University of Denmark
Sequential plasma and gaseous nitriding of Fe–18Cr–10Ni–3Mo stainless steel at 390°C with 14N and 15N isotopes followed by denitriding in flowing hydrogen was investigated. Redistribution of plasma-inserted nitrogen atoms (15N) by subsequent gaseous nitriding (14N) was observed. Denitriding after plasma- and gaseous nitriding resulted in predominant retraction of 14N, and only a minor amount of 15N. The nitrogen isotope diffusion behaviour is explained by two different states of nitrogen bonding and short-range ordering between nitrogen and chromium.
Scripta Materialia, 2013, Vol 69, Issue 8, p. 582-585