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文中提出了一种适用于电渣重熔的还原稀土氧化物加稀土的新工艺。从热力学分析了用铝、钙、硅、钛及铁铬铝中的铝还原稀土氧化物成稀土金属进入合金的可能性。根据活度、熔体性质及正交设计试验确定了新的稀土渣系的合理组成及相应的工艺条件。实验表明,用稀土渣进行电渣重熔能使OCr25A15中含稀土量达0.02％,与Al_2O_3-CaF_2系比较它具有更强的去氧、氮、硫、磷、氢及夹杂的能力。再加稀土改变了夹杂物的类型和形貌。使OCr25A15合金在1350℃寿命达62小时以上,常温韧性及寿命试验后的伸长率亦得到了改善。
In this paper, a new process of rare earth oxide reduction plus RE for electroslag remelting is proposed. From the thermodynamic analysis of aluminum, calcium, silicon, titanium and iron chromium aluminum aluminum reduction of rare earth oxides into rare earth metals into the possibility of the alloy. Based on the activity, melt properties and orthogonal design tests, the reasonable composition of the new rare earth slag system and the corresponding process conditions were determined. Experiments show that the rare earth slag ESR can make the rare earth content of OCr25A15 up to 0.02%, compared with Al 2 O 3 -CaF 2 system it has stronger ability of deoxidation, nitrogen, sulfur, phosphorus, hydrogen and inclusions. Together with rare earth changes the type and morphology of inclusions. OCr25A15 alloy at 1350 ℃ life of more than 62 hours at room temperature toughness and elongation after life test has also been improved.