In this work we focus on characterization of LC200N steel by back-scattering Mössbauer spectrometry (MS). This geometry was used due to high sample thickness (0.5 mm). MS is a method suitable for determination of iron compounds and their properties in steels. We investigated samples with three different thermal treatments: non-hardened, hardened, and hardened with subsequent rapid quenching. Disk-shaped samples were cut off from original rods and polished from one side. The effect of surface treatment was investigated, too. Variations in microstructure imposed by different thermal and surface treatments were unveiled by Mössbauer parameters of backscattering spectra taken from both sides of the investigated samples. In this way, differences between the original as-cut and polished surfaces of the disks were unveiled.

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