ABRASIVE WEAR BEHAVIOR–MECHANICAL PROPERTIES–MICROSTRUCTURE RELATION OF Fe–C B–13 wt. % Cr Ti AND Fe C B 4 wt. % Cr 7 wt. % Cu–Ti BASED HARDFACING ALLOYS

Abstract

In this research, the mechanical and tribological properties of two deposited metal of Fe–C–Cr–B–Ti alloying systems, high chromium 140Cr13Si1MnBTi alloy, and low chromium and high copper 110Cr4Cu7TiVBAl alloy applied by flux-cored arc welding process (FCAW) was studied. Samples of deposited alloy with a high content of chromium (13 % by weight of Cr) received with self‒shielded flux‒cored wire electrode without exothermic additions were investigated. For comparison, we also analyzed the deposited metal received from the self-shielded flux-cored wire electrode with exothermal addition (CuO‒Al) introduced to the core filler. It provided a low content of chromium (4 wt. %) and a high content of copper (7 wt. % Cu). The microstructure was analyzed by scanning electron microscopy X-ray and diffraction transmission electron microscopy. The introduction of the exothermic additive (CuO-Al) had a positive effect on the mechanical properties of the deposited metal, increasing the average values of microhardness, modulus of elasticity and ductility. Results of the studies had showed that the introduction of exothermic addition (CuO‒Al) to the core filler of the flux‒cored wire electrode provides the highest resistance of the deposited metal to abrasion wear due to additional alloying by copper and reduction in grain size.