All samples were characterised by optical microscopy and scanning electron microscope (SEM) images as well as by means of surfaces and cross sections.The compound layer thickness was established by means of element concentration profiles (first estimation), using glow discharge optical emission spectroscopy (GDOES) and by optical microscope measurement. The diffusion layer thickness was determined from hardness-depth-profile.The composition of nitride layers (compound and diffusion layer) were determined by means of element concentration profiles using glow discharge optical emission spectroscopy (GDOES).The transformation depth after EB surface remelting was determined using hardness-depth-profiles. Surface and layer hardness measurements were carried out by the Vickers method with a load of 30 N. Surface roughness measurements were made
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