Effect of Ti content on microstructure toughness of deposited metal with flux cored wire

The effects of Ti content on microstructure characteristic of deposited metal with flux cored wire were investigated with different contents of Ti-Fe powder under the protection of CO₂ and Ar+20%CO₂.The results show that the inclusions in deposited metal are mainly complex oxides composed of MnO-TiO_x-Al₂O₃-SiO₂ in Si-Mn-Ti deoxidized flux cored wire.With the increasing of Ti content in flux cored wire, the content of Ti in the inclusions increases, and most of inclusions are in the range of 0.3~2.0 μm in diameter, which promote the formation of acicular ferrite, thus those contribute to the increased toughness of deposited metal.Dissociative Ti can improve the intensity and the rigidity of microstructure, but it does worse to the microstructure toughness when too much dissociative Ti gets into the microstructure of deposited metal.