Abstract

The peculiarities of the nn-metallic inclusions containing titanium influence on the low-alloy steels weld metal microstructure formation were studied. It was shown that ferrotitanium and titanium oxides inoculation into the welding bath promotes the amorphous manganese silicate inclusions formation with a layer of crystalline (Ti,Mn) oxides on the surface. In the case of titanium carbide inoculation, the content of multiphase morphology inclusions in the weld metal increases, which have an external layer with a high carbon content on the surface. It was shown that the mechanism of AF nucleation may be different depending on the nature of the titanium-containing phase located on the inclusions surface. The zone depleted in manganese content formation mechanism is triggered in the case of Ti₂ O₃ inclusions dominance, and a low level of interfacial energy is triggered in the case when a layer of (Ti,Mn) oxides is retained on the inclusions surface.

Keywords:Metallurgy; Welding; Metallography; Non-Metallic Inclusions; Microstructure; Inoculants