关键词: GCr15轴承钢, 精炼渣, 矿相, 热力学模拟

Abstract: With using Factsage thermodynamic calculation and test in laboratory, the effect of basicity (R)2.5 -5.4, Al₂O₃ (14%-30% ) and MgO (3%-15% ) content on mineralogical phases precipitation in CaO-Al₂O₃-SiO₂-MgO quaternary refining slag for bearing steel GCr15 has been studied. Results show that at 1 600 °C , with basicity of slag increasing from 2.4 to 5.4, the amount of precipitation of silicate mineral in slag decreases from 56% to 30% , the total precipitation amount of three kinds of minerals of Ca₃Al₂O₆、Ca₃MgAl₄O₁₀ and CaAl₂O₃ increases from 28. 0% to 58. 2% ； with increasing Al₂O₃ content in slag from 14% to 30% (R4. 4, 7% MgO),, the precipitated metal oxide solid solution amount decreases from 26% to 3. 5% , silicate minerals decrease form 42% to 33% , while the precipitated amount of three kinds of minerals of Ca₃Al₂O₆、Ca₃MgAl₄O₁₀ and CaAl₂O₃ increases from 32. 2% to 63.2% ； and with increasing MgO content in slag from 5% to 15% (R4.4, 26% Al₂O₃) , the change of precipitated amount of silicate minerals, Ca₃Al₂O₆、Ca₃MgAl₄O₁₀ and CaAl₂O₄ is not obvious. With basicity of slag 4-5, 4. 5%-5. 5% MgO and 24%-27% Al₂O₃, the quaternary slag has suitable viscosity and melting temperature , and has better fluidity and ability to absorb inclusions in liquid. The thermodynamic simulation results are consistent with the results of mineralogical phases ingredient defined by hot status remelting experiment.