Abstract
The thermal stability and the magnetic nature of metastable nitrided surface layers produced by plasma immersion ion implantation at 300°C on an austenitic X6CrNiTil810 (f.c.c.) and a ferritic X10CrA118 (b.c.c.) stainless steels were examined. The surface phase analysis was performed by the Conversion Electron Mossbauer Spectroscopy (CEMS) and the results were correlated with X-ray diffraction and microhardness measurements. The dominant phase in the as-nitrided surfaces of both steels was found to be expanded austenite (S-phase). The first structure changes of phase composition of the surface of the ferritic X10CrA118 steel were detected after an annealing at 200 °C while in the case of the austenitic X6CrNiTi1810 steel at 250°C. The lower stability of the ferritic steel is ascribed to higher diffusion of nitrogen atoms in b.c.c. structure and to a lack of other austenite stabilising elements besides nitrogen.
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