摘要
采用热力学方法对镁处理钢中夹杂物的变性进行了计算,计算结果表明,钢中w(Als)=0.02%~0.05%,只要有微量镁的存在,就有可能生成单独的MgO·Al2O3在热力学计算的基础上,对轴承钢进行了镁铝合金脱氧实验研究,结果表明镁铝合金处理钢液后,钢中的夹杂物主要以MgO·Al2O3夹杂物为主,随机分布在钢中,这种尺寸细小的尖晶石夹杂物对钢的疲劳等性能有害程度很小。溶解在轴承钢中的镁起到了球化碳化物的作用,并且随着镁铝合金中镁含量的增加,这种效果越明显。
The modification of inclusions in magnesium treated steel was calculated thermodynamic method. Results show that under the condition of dissolved aluminum content within 0. 0l % to 0.04%, trace of Magnesium in molten steel will lead to the formation of MgO·Al2O3 spinel inclusions. Based on the thermodynamic calculation, deoxidation experiments of bearing steel were done using magnesium aluminum alloy. The experimental results show that the inclusions in the steel treated by magnesium aluminum alloy are mainly composed of MgO·Al2O3 randomly distributed in the steel. The spinel inclusions with such tiny grain size is of very little harm on the mechanical properties of steel, such as the fatigue capability. Magnesium dissolved in steel will help spheroidize the carbide and this effect increases with the augment of the magnesium content in the magnesium aluminum alloy.
出处
《炼钢》
CAS
北大核心
2009年第5期52-54,77,共4页
Steelmaking