摘要
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Fe1-yO中扩散,使Fe1-yO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。
The microstructure development of oxide scale on low carbon steel under continuous cooling conditions was studied in laboratory.After them-recycle,two kinds of oxide scale structure were observed by using optical microscope. The first kind of scale is only comprised of magnetite precipitates and wustite. While the other kind is constituted with magnetite / iron eutectoid,magnetite precipitates and remained wustite. The results show that lower cooling rate is favor to the eutectoid reaction. When the sample is coiled at 400-500 ℃,most of the wustite transform to a mixture of magnetite / iron eutectoid. When the coiling temperature is much higher than 570 ℃,the cation vacancy of wüstite can reduce owing to the diffusion of ferrous iron,and the wüstite with low cation vacancy need more time for the eutectoid reaction.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第1期178-182,共5页
Transactions of Materials and Heat Treatment
基金
国家"十二五"科技支撑计划(2011BAE13B04)
国家自然科学基金(51204047)
中央高校基本科研业务费项目(N130407004)
关键词
氧化铁皮
组织转变
卷取温度
冷却速率
oxide scale
structure development
coiling temperature
cooling rate
