Al-Ti-Mg复合脱氧对钢中夹杂物及组织的影响

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

摘要: 通过采用Fe-50%Ti、Ni-16.7%Mg和Fe-70.74%Si等合金对工业纯铁脱氧,研究了Al-Ti-Mg复合脱氧低碳钢中夹杂物的类型和尺寸分布规律以及钢的铸态组织.实验结果表明:Ti处理比未加Ti处理试样夹杂物总量增加400mm^-2,而且夹杂物明显细化;Ti-Mg复合脱氧,钢中夹杂物的总量相对于Mg单独处理增加200 mm^-2;Ti处理后,奥氏体晶粒内出现大量针状铁素体.对比而言,Al-Ti-Mg复合处理钢中针状铁素体分布最为均匀,无块状铁素体出现.

Abstract: 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.