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利用实验室渣-钢平衡试验研究了高碱度精炼渣对GCr15轴承钢中w(T[O])和夹杂物的影响。结合试验结果和热力学分析,探讨了钢中w(T[O])、夹杂物尺寸分布和粒径大小的变化规律,以及氧化物夹杂的转变过程。研究结果表明,碱度为6时,精炼渣(59.4%CaO-24.8%Al_2O_3-9.8%SiO2-6%MgO)可将钢中w(T[O])控制在0.0006%以内,氧化物夹杂平均尺寸最小为2.26μm。随着钢中w([Ca])和w([Mg])的增加,钢中氧化物夹杂转变过程为Al2O3→MgO·Al2O3→MgO→CaO-Al2O3-MgO复合夹杂物(核心为MgO,外围包裹着CaO-Al_2O_3)。渣-钢反应前期钢中以MgO·Al_2O_3为主,后期以MgO和CaO-Al_2O_3-MgO复合夹杂物为主。氧化物夹杂转变的试验结果与热力学分析结果相一致,大多数氧化物夹杂尺寸小于5μm。
The effects of high basicity refining slag on w (T [O]) and inclusions in GCr15 bearing steel were studied by laboratory slag-steel balance test. Combined with the experimental results and thermodynamic analysis, the variation of w (T [O]), the size distribution of inclusions and the size of inclusions, and the transformation process of oxide inclusions were discussed. The results show that the refining slag (59.4% CaO-24.8% Al_2O_3-9.8% SiO2-6% MgO) can control the w (T [O]) in the steel to be less than 0.0006% The minimum size is 2.26μm. With the increase of w ([Ca]) and w ([Mg]) in the steel, the inclusions of inclusions in the steel are Al2O3 → MgO · Al2O3 → MgO → CaO-Al2O3-MgO composite inclusions Wrapped with CaO-Al 2 O 3). The slag-steel pre-reaction steel is dominated by MgO · Al 2 O 3 and later mixed inclusions of MgO and CaO-Al 2 O 3 -MgO. The experimental results of the oxide inclusions transition are consistent with the results of the thermodynamic analysis. Most of the oxide inclusions have a size of less than 5 μm.