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为了对42CrMoA钢CaO-SiO2-MgO-Al2O3系夹杂物低熔点区域进行控制,利用热力学计算软件FactSage计算了1 873K温度下的42CrMoA曲轴钢钢液与CaO-SiO2-MgO-Al2O3系夹杂物之间的平衡。结果表明:CaO-SiO2-MgO-20%Al2O3系夹杂物的低熔点区域面积最大,w(CaO)、w(MgO)和w(Al2O3)对夹杂物低熔点区域的影响较为显著;夹杂物的成分落在低熔点区域内,各氧化物的活度应控制在CaO 0.001~0.1、SiO20.001~0.009、MgO 0.001~0.09、Al2O30.001~0.09范围内;与之平衡的钢液中[O]和[Al]的质量分数分别为(5~15)×10-6和(1~13)×10-6。
In order to control the low melting point region of CaO-SiO2-MgO-Al2O3 series inclusions in 42CrMoA steel, thermodynamic calculation software FactSage was used to calculate the relationship between 42CrMoA crankshaft steel liquid and CaO-SiO2-MgO-Al2O3 series inclusions at 1873K Balance. The results show that the CaO-SiO2-MgO-20% Al2O3 inclusions have the largest area of low melting point and the inclusions of w (CaO), w (MgO) and w (Al2O3) The composition falls in the low melting point region, the activity of each oxide should be controlled in CaO 0.001 ~ 0.1, SiO20.001 ~ 0.009, MgO 0.001 ~ 0.09, Al2O30.001 ~ 0.09 range; with the balance of molten steel [O ] And [Al] are (5-15) × 10-6 and (1-1.3) × 10-6, respectively.