Samples were ground using 500mesh sandpaper before the
treatment and 200, 400, 600, 800, 1000 and 1200 mesh sandpapers
respectively and polished using 3m diamond paste before etching
in 2% Nital solution after the treatment. Cross sections of the
boronized steels were examined using a JEOL JSM-6060 LV brand
scanning electron microscope.