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使用ASPEX PSEM explorer研究了帘线钢中氧化物夹杂的成分及形态在炼钢与轧制过程的变化。结果表明,连铸坯夹杂物中SiO_2质量分数较中间包有增加趋势,并在铸坯中发现MnO-SiO_2-Al_2O_3和SiO_2构成的复合夹杂物,轧制盘条中出现未很好变形的SiO_2夹杂物。热力学分析表明:由于连铸过程钢液和夹杂物间的传质作用,导致铸坯夹杂物中SiO_2质量分数增加,MnO-SiO_2-Al_2O_3系夹杂在浇铸过程较CaO-SiO_2-MnO-Al_2O_3系夹杂物更易析出SiO_2相,形成MnO-SiO_2-Al_2O_3为基体的复合夹杂物。CaO-SiO_2-Al_2O_3-MnO和MnO-SiO_2-Al_2O_3夹杂物在盘条中呈长条状,MnO-SiO_2-Al_2O_3和SiO_2析出相构成的复合夹杂在轧制过程将发生相分离,形成“眼睛状”或单颗粒状夹杂。
ASPEX PSEM explorer was used to study the composition and morphology of oxide inclusions in cord steel during the steelmaking and rolling process. The results show that the mass fraction of SiO_2 in the inclusions in the casting slab tends to increase compared with that in the tundish, and the composite inclusions of MnO-SiO_2-Al_2O_3 and SiO_2 are found in the slab. The un-deformed SiO_2 Inclusion. The results of thermodynamic analysis show that the mass fraction of SiO 2 in inclusions of slab increases due to the mass transfer between molten steel and inclusions in the continuous casting process. The inclusion of MnO-SiO 2 -Al 2 O 3 in the casting process is more complicated than that of CaO-SiO 2 -MnO-Al 2 O 3 The more precipitated SiO 2 phase, the formation of MnO-SiO 2 -Al 2 O 3 matrix composite inclusions. The inclusions in CaO-SiO_2-Al_2O_3-MnO and MnO-SiO_2-Al_2O_3 are elongated in the wire rod, and the composite inclusions formed by the precipitation of MnO-SiO_2-Al_2O_3 and SiO_2 phase separation will occur during the rolling process to form “eyes Like ”or single granular inclusions.