Modification of wear-resistant coatings of Fe-Cr-C system based on the Cr3C2 obtained with help of SHS method

The article deals with new wear-resistant materials of the Fe-Cr-C system, designed to strengthen the working bodies of machines by high-performance inductive surfacing. Materials are presented by a mixture of powders (burden) based on high-alloy chromium-plated cast iron of type PG-USC25 (in Russian) and flux P-0.66, modified by cermet based on Cr3C2, obtained by the SHS method. The peculiarity of the modifier proposed by the authors is that the open pores of this ceramic are filled with the main, matrix material of the future wear-resistant coating - cast iron PG-CS-25 (in Russian), which is used in the SHS as an inert. X-ray diffraction studies of cermet and metallographic studies of surfaced coatings have been performed.It was shown that the introduction into the prepared burden for inductive surfacing up to 25% by weight specified cermet allows to increase hardness (up to 1320 HV) and wear resistance of the welded material. The effect is explained by formation in the hardening coating of up to 20% by vol. of new phase - the needle-shaped carbide Cr7C3 due to recrystallization and change in the composition of carbides formed from artificially introduced Cr3C2 and already available in matrix eutectic cast iron, chromium and carbon. (paper)