About the article
V.V. IZMAILOV, Dr. Sc., L.E. AFANASIEVA, Cand. Sc., M.V. NOVOSELOVA, Cand. Sc.
The results of studies of the characteristics of abrasive wear resistance of steel specimens hardened by laser hardening in the course of continuous radiation from a multichannel CO2 laser are presented. It is shown that the gradient of mechanical properties in depth, which is the result of laser action on the material, can lead to an increase in the wear rate during friction. This circumstance has to be taken into account in the experimental determination of the wear resistance characteristics of materials in rubbing pairs. It is shown that the well-known Holm – Archard wear equation is also applicable in the case of wear of parts with a hardness gradient in depth. A formula is obtained for calculating the wear coefficient in such conditions. Based on the obtained theoretical dependences, the wear resistance characteristics of specimens made of two grades of steel (R6M5 and 30KhGSA) after laser surface hardening were experimentally determined: the wear coefficient and the specific energy of destruction of the material during wear. It is shown that laser action reduces the coefficient of friction and increases the wear resistance of specimen surfaces made of high-speed steel by 20…30 %.
laser hardening; constructional steel; high speed steel, abrasive wear resistance, wear coefficient