Fig. 17

Gas nitriding of S17 sample, at 1050 °C for 10 min in electric furnace. (a) sample S17 after nitriding, (b) OM of cross-section microstructure on top part of the sample, (c) SEM image on the top part of S17 cross-section, (d,e) line scan SEM–EDS analysis on the top of S17 cross-section.