2013•Advanced materials researchOpen access
Effects of Magnesium on Inclusions in Consumable Electrode of H13 Die Steel
Liang Wang, Jing Li, Bo Ning, Yong Yong Li
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Abstract
Consumable electrodes of H13 die steel with different magnesium contents were produced by medium frequency induction furnace. Effects of magnesium on deoxidation rate and inclusions in consumable electrode were studied. Results show that the deoxidization ability of Fe-Al-Mg alloy is better than that of aluminum and the dissolved oxygen content is decreased with the increase of magnesium content in liquid steel. The deoxidation rate is less than 15 % for steel without magnesium and more than 24 % for steel with 20 × 10-4wt% magnesium content. The number of inclusions is decreased with the increase of the magnesium content in steel. Because tiny MgO·Al2O3inclusions are generated in the steel containing magnesium, the number of inclusions with size less than 2 μm is increased obviously and the number of inclusions with size larger than 5 μm is decreased. Some VN and VN-TiN inclusions with size less than 10 μm are precipitated taking MgO·Al2O3, MgO, MgS as cores in the steel containing magnesium.