通过实验室坩埚实验，探讨了1 873 K下合金结构钢液、渣、夹杂物之间的热力学关系。首先通过预平衡实验，确定了钢渣反应达到平衡所需时间为90 min。随后，进行了7炉平衡实验，探讨了平衡实验中钢液、夹杂物、渣三者间的关系。结果表明，1 873 K下，钢液与炉渣反应90 min后，钢中夹杂物主要为2 μm左右的细小球形MgO·Al2O3尖晶石夹杂物。钢渣反应平衡时，镁铝尖晶石夹杂物中log(XMgO/XAl2O3)分别与钢液中log[a[Mg]/(a2[Al]·a2[O])]、渣中log(aMgO/aAl2O3)线性关系良好，斜率接近于1。
Thermodynamic equilibrium of molten steel, inclusion and slag has been discussed. First, preequilibrium experiments have been carried out to find out the time for steel and slag to attain equilibrium. And it is found that 90 minutes are sufficient to establish equilibrium between slag and steel at 1 873 K. Afterwards, seven equilibrium experiments were carried out and relations among steel, inclusion and slag were discussed. Results of equilibrium experiments show that inclusions in steel were mainly tiny and globular MgO·Al2O3 spinel inclusions with about 2 μm in diameter. log(XMgO/XAl2O3) in spinel inclusions is linear with log[a[Mg]/(a2[Al]·a2[O])] of steel and log(aMgO/aAl2O3) of slag respectively, which reflected the characteristics of thermodynamic equilibrium.
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