The
study included two processes: the 506 process 3n_15d_2 n (3 min
of boostþ15 min of diffusionþ2 min of boost); the 505 process e
3n_15d_2n_1d (as process 506 þ1 min of diffusion). The carburized
face surface of the samples was subsequently observed in the
polarized light of the optical microscope and the electron microscope
(JEOL 5600JV). Moreover, Raman scattering of the light was
investigated with a LabRAM HR 800 spectrometer (HORIBA Jobin
Yvon) with different laser excitations: 633, 514, and 488 nm. The
spectra were recorded from different places on the sample. Using
the optical microscope connected to the spectrometer it was
possible to choose a region on the sample.