Abstract: Thermodynamic conditions to modify Al₂O₃ inclusions in bearing steel GCr15 by Mg have been calculated which was obtained that as [Als] was 0. 03%, 2. 0 x 10^-6% Mg in steel could modify the Al₂O₃ to form MgO·Al₂O₃. With added 1 g magnesium aluminum powder containing 16. 55% Mg in 1 kg bearing steel liquid in a MoSi2 electric resistance furnace to test the effect of Mg on Al₂O₃ inclusion modification. The test results showed that after added Mg, ≥10μm Al₂O₃ inclusions were modified to fine, spherical magnesium-aluminum spinel inclusions, of which ≤5 μm inclusions accounted for 99. 46% , others were 5 ~ 10 μm inclusions.

摘要： ^{计算了Mg对GCr15轴承钢中Al}₂^O₃^{夹杂物进行变质的热力学条件,得出当[Als]为0.03%时,钢中存在2.0×10-6%Mg即能对Al}₂^O₃^{夹杂起变质作用,生成MgO·Al}₂^O₃^{。通过MoSi2电阻炉对1 kg轴承钢水插入1g含16.55%Mg的镁铝合金粉,试验Mg对Al}₂^O₃^{夹杂的变质效果。实验结果表明,加Mg后,钢中≥10μm Al}₂^O₃^{夹杂转变成细小、球形镁铝尖晶石夹杂,其中≤5μm夹杂占99.46%,其余为5～10μm夹杂。}