Influence of Al-Ti-Mg complex deoxidation on the inclusions and microstructure of steel

The phases,size distribution and morphology of inclusions as well as the microstructure of low carbon steel which is complex deoxidized by Al-Ti-Mg were investigated by technically deoxidizing pure iron with Fe-50%Ti,Ni-16.7%Mg and Fe-70.74%Si.The experimental results show that in comparison with non-Ti-treated samples the total number of inclusions in the Ti-treated steel increases by 400 mm^-2,meanwhile the size of inclusions decreases obviously.Comparing with Mg deoxidizing,the total number of inclusions in the Ti-Mg complex deoxidized steel increases by 200 mm^-2.There is a large number of acicular ferrite in austenite grains after being Ti-treated.The distribution of acicular ferrite is the most uniform and no polygon ferrite was observed in the Al-Ti-Mg complex deoxidized steel.