Fretting resistance of laser coatings

摘要

Abstract: Comparative investigations of fretting-resistance of laser coatings applied on high-strength steel and nickel alloys were carried out over a wide range of temperatures under conditions approximate to operating ones at dynamic vibrocontact loading. At 1000$DGR@C carbide-containing coats were demonstrated to be correlated according to wear resistance with cast heat-resistant alloys. They are several times superior to carbideless coatings, including an argon-arc coat used during repair of turbine engine blades. At 1200$DGR@C carbide-containing coats maintain their strength as opposed to cast materials and coats based on nickel. Tests performed at room temperature show that coatings of self- fluxing alloy powders increase 2.3 to 3.5 times the fretting resistance of 30X$Gamma@CA volume- hardened steel and as a mixture with carbide powder nearly by an order, whereas laser hardening by both continuous and pulse-periodic beam raises fretting resistance only 1.4 times. The obtained results indicate that application of laser coatings on friction pairs operating under the discussed conditions is advisable. !3