实验室条件下研究了低碳钢表面氧化铁皮在连续冷却过程中的组织转变,分析了卷取温度和冷却速率对Fe1-yO相变的影响.在不同连续冷却条件下,最终的氧化铁皮结构可分为两类,第一类氧化铁皮只包含先共析Fe3O4和残余Fe1-yO;第二类氧化铁皮由共析组织、先共析Fe3O4和少量残余Fe1-yO组成.结果表明,低冷却速率有利于共析反应的发生.在400～500℃,Fe1-yO最不稳定,在该温度区间卷取,最终氧化铁皮中将出现大量的共析组织.当卷取温度远高于570℃,Fe2在Fe1yO中扩散,使Fe1yO的阳离子空位浓度降低,稳定性提高,这种Fe1-yO的共析转变需要更长时间,最终的氧化铁皮中共析组织含量较低.
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