Metallographic studies results of 20kH13 steel samples with textured relief, modified surface and protective coatingAlexey Mednikov, Aleksandr Tkhabisimov, Marat Dasaev, Andrey Burmistrov and Olga ZilovaE3S Web Conf., 140 (2019) 02009DOI: https://doi.org/10.1051/e3sconf/201914002009