The nanomodification influence on the microstructure formation of low alloy steel welds metal

Studies on the nano-sized refractory particles inoculation of oxides Al₂O₃, TiO₂, MgO, ZrO₂ into the welding bath were performed. The oxides inoculation with a low level of mismatch to the δ-Fe lattice and increased wetting with liquid iron (MgO, ZrO₂) into the weld pool contributes to the dendrite’s growth. Metal modification with oxides Al₂O3, TiO₂ contributes to an increase in the polygonal ferrite hardness and an increase in the upper bainite content in the weld’s microstructure, growth the low-alloy steel welds strength indicators.