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对Mg与钢中氧化物和硫化物的相互作用进行了热力学分析,计算结果表明对于铝脱氧钢由于MgO夹杂生成区域很大,而Al2O3生成区域很小,镁处理很容易对氧化铝夹杂进行变性;对于MnS夹杂只要w(Mn)/w(Mg)≥492时就能对钢中MnS夹杂进行变性。随后通过实验对热力学结果进行验证。实验采用GCr15轴承钢原料重熔,用w(Mg)=20%的Ni-Mg合金进行Mg处理,结果表明:实验结果与热力学分析基本吻合。镁处理氧化物和硫化物的变性效果比较明显,钢中Al2O3和MnS夹杂转变成MgO-MgS、镁铝尖晶石类和MgO-MgS-MnS复合夹杂。
The thermodynamic analysis of the interaction between Mg and the oxides and sulfides in steel has been carried out. The calculation results show that the formation of MgO inclusions is very large and the formation area of Al2O3 is very small for the aluminum deoxidized steels. Magnesium treatment can easily denature alumina inclusions ; For MnS inclusions MnS inclusions in steel can be denatured as long as w (Mn) / w (Mg) ≥ 492. The results of thermodynamics are then verified experimentally. The experiment uses GCr15 bearing steel remelting, with Mg (Mg) = 20% Ni-Mg alloy for Mg treatment, the results show that: the experimental results are basically consistent with the thermodynamic analysis. Magnesium oxide and sulfide denaturation effect is obvious, the steel Al2O3 and MnS inclusions into MgO-MgS, Mg-Al spinel and MgO-MgS-MnS composite inclusions.