本文研究了镁对H13模具钢中夹杂物的影响，对H13钢中夹杂物的变性进行了热力学计算，分析了镁对夹杂物成分、形貌和粒径分布的影响。结果表明，镁处理H13钢后，夹杂物由Al2 O3转变为MgO·Al2 O3，复合型夹杂物的析出位置也发生了改变，夹杂物粒径变小。镁处理使钢中1μm左右的夹杂物增多，2μm以上的夹杂物减少，随着镁含量的升高，粒径的变化更明显。铝质量分数为0．01％～0．03％的H13钢中，微量的镁就可促使MgO·Al2O3夹杂物形成，镁质量分数超过1×10-4会导致H13钢中MgO·Al2O3完全消失，镁质量分数在3×10-5～5．5×10-5时钢液中镁铝尖晶石的数量达到最多。%The effect of magnesium on inclusions in magnesium treated H13 die steel was studied,the modification of inclusions in H13 die steel was calculated by thermodynamics,and the component,shape,particle size distribution of the inclusions were in-vestigated.The results show that the inclusion changed from Al2 O3 to MgO·Al2 O3 after magnesium was treated,precipitation location of compound type inclusions was changed,and particle size was modified to be tiny;the quantity of inclusions whose par-ticle size is around 1μm increased after magnesium treatment,while the quantity of those inclusions larger than 2μm decreased, and the change of particle size is more obvious with higher magnesium content;under the condition of dissolved aluminum content between 0.01%-0.03%,micro content of magnesium in molten steel will lead to the formation of MgO·Al2 O3 spinel inclusions, MgO·Al2O3willdisappeartotallywhenmassfractionofmagnesiumislargerthan1×10-4.ThequantityofMgO·Al2O3inliq-uid steel achieves the highest when mass fraction of magnesium is in the range of 3×10-5-5.5×10-5 .
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