Effect of Titanium Carbide in a Flux Cored Wire Charge on the Structure of a Deposited Metal

Changes in the microstructure and hardness of the metal deposited with flux-cored wires 2.0 and 1.6 mm in diameter, which are characterized by different contents (from 9.8 to 29 wt %) and types of titanium carbide, are studied during their deposition with a nonconsumable electrode. The structure of the deposited metal is shown to contain both retained coarse titanium carbide and fine titanium carbide particles no more than 10 μm in size. The effect of nickel added to the composition of flux cored wire charge, both in the form of pure nickel and as part of TiC + Ni composite granules prepared by combined processing of nickel and titanium carbide powders in a planetary mill, on changes in the structure formation and the hardness of the deposited metal is studied. The use of nickel in the flux cored filler wire is shown to decrease the amount of introduced titanium carbide and to increase the hardness.