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采用管式电阻加热炉,对Fe-0.6Si合金在不同温度下表面生成的氧化铁皮的等温转变行为进行了研究。结果表明:氧化铁皮为4层分层结构,由外向内依次为较薄的Fe_2O_3层,Fe_3O_4层,较厚的FeO层和Fe_2SiO_4层。在等温氧化过程中,由于受离子浓度和体系中自由能以及过冷度的影响,氧化铁皮在400、450、500℃等温转变时,在金相检测中可以发现先共析Fe_3O_4相,没有出现共析产物;在550~650℃之间没有出现先共析组织和共析组织。
The tubular electrical resistance furnace was used to study the isothermal transformation behavior of the scale formed on the surface of Fe-0.6Si alloy at different temperatures. The results show that the scale is a 4 - layer layered structure with thinner Fe_2O_3, Fe_3O_4, thicker FeO and Fe_2SiO_4 layers from outside to inside. During the isothermal oxidation process, the proeutectoid Fe_3O_4 phase did not appear in the metallographic examination due to the ion concentration and the free energy in the system and the degree of undercooling, when the scale was isothermally transformed at 400, 450 and 500 ℃ Eutectoid products; no eutectoid and eutectoid structures were observed between 550 and 650 ℃.