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采用扩散偶的方法,利用高温共聚焦激光显微镜和高温感应炉研究了1473K热处理过程中Fe-Mn-Si合金与MnO-SiO_2-FeO氧化物的固相反应及其对二者成分及物相的影响规律,并分析了凝固过程中合金与氧化物平衡成分变化情况,揭示了高温界面固相反应控制MnO-SiO_2-FeO氧化物变性的内在机理。结果表明,热处理过程中合金与氧化物发生的界面固相反应造成合金内Mn、Si元素的损耗,靠近界面处合金内会形成大量MnO-SiO_2颗粒,而氧化物中由于FeO成分的分解,产生了单质Fe颗粒,随热处理时间的延长,MnO和FeO含量分别呈上升和下降的趋势。
Using diffusion couple method, the solid-state reaction of Fe-Mn-Si alloy and MnO-SiO 2 -FeO oxide during 1473K heat treatment was studied by high-temperature confocal laser microscope and high temperature induction furnace. The influence of the solidification process on the equilibrium composition of the alloy and oxide was analyzed. The intrinsic mechanism of MnO-SiO_2-FeO oxide denaturation controlled by solid-state reaction at high temperature was revealed. The results show that the interfacial solid-state reaction between the alloy and the oxide during the heat treatment causes the loss of Mn and Si in the alloy, and a large amount of MnO-SiO 2 particles are formed in the alloy close to the interface, and the oxide is decomposed due to the FeO component Elemental Fe particles, with the extension of heat treatment time, MnO and FeO content showed a rising and falling trend.