Nitriding of a tool steel with an electron-beam-excited plasma
Schematic diagram of the nitriding apparatus with electron-beam-excited plasma (EBEP) source.
Photograph taken through a viewing port of eight electron beams generated between a ring-shaped electrode and an insulator cup with eight holes.
Hardness-depth profiles of nitrided SKD61 samples. The data were obtained for different radial positions in the furnace: (circles), (cross), (triangle), (plus), and (square).
Cross-sectional micrograph of the nitrided SKD61 sample. The sample was nital etched.
X-ray diffraction patterns of the nitrided SKD61 sample for different depths: (a) (surface), (b) , (c) , (d) , and (e) . The two thin lines show the positions of Bragg’s peak of pure. The x-ray was used.
Densities of nitrogen atoms, hydrogen atoms, and plasma electrons as functions of the electron beam current with the least mean square fitting curves. Circle denotes nitrogen atoms, triangle denotes hydrogen atoms, and square denotes plasma electrons.
Nominal chemical composition (wt %) of SKD61 (JIS), which is a commercially sold steel.
Experimental conditions for nitriding.
Experimental conditions for diagnoses of the plasma atmosphere.
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