Comparison of microstructure, hardness and wear resistance of 4 type's hard-face alloys with heat treated hardened CK70 steel, in order to replace for cut blades applications

In most cases, the steel blades used for cutting various types of plastics, rubbers, metals and woods, are made of high carbon steels. By performing the surface hardening heat treatment, makes the hardface layer of these blades for cutting applications. The St37 steel used as a substitute and 4 different electrodes types were used and the hard face layers were fabricated by SMAW process.The results of the chemical analysis were done on the weld metal of the electrodes shows that presence of about 0.5% carbon with different amounts of carbide formeres elements had made different hardness and the wear resistance. The Fe-Cr-Mo-V-W hardface alloy with code "WD" had the highest hardness and wear resistance than does the others. The microstructure of "WD" hardface layers obtained martensite, austenite and alloy carbides. In addition the "WD" sample has the higher hardness and wear resistance in comparison with heat treated hardened CK70 steel samples and can replace for cutting blades applications.