Effect of Temperature on Scale Morphology of Fe-1.5Si Alloy

Effect of Temperature on Scale Morphology of Fe-1.5Si Alloy
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温度对Fe-1.5Si合金氧化皮形貌的影响

DOI:
10.1016/s1006-706x(13)60199-5
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发表时间:
2013-11
影响因子:
2.5
通讯作者:
Zhen-yu LIU
Zhen-yu LIU
中科院分区:
材料科学2区
文献类型:
--
作者:
Guang-ming CAO;Yong-quan HE;Tao JIA;Zhen-yu LIU

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由于硅对氧化皮形成的影响,红鳞是热轧铁硅板的主要表面缺陷,与碳钢相比,红鳞难以除鳞。采用热重分析仪(TGA)模拟了Fe-1.5 Si合金在空气条件下60min的等温氧化过程,温度范围为700 ~ 1200℃。采用电子探针微量分析(EPMA)观察了截面氧化垢形貌,分析了氧化垢元素分布。得到了温度、水垢厚度和水垢结构的关系图。除1000℃和1200℃外,合金表面的氧化铁层+内部的FeO/ fe2sio4层+内部的氧化硅析出物(鳞状结构)随温度变化基本不变。1000℃时,合金的亚表面没有氧化硅析出物,而在1200℃时,FeO/ fe2sio4不但正常形成一层,而且深入到外部的氧化铁层中。
Because of the effect of silicon on the formation of oxide scale, red scale is the main surface defect of hot-rolled Fe-Si plate, making the scale difficult for descaling compared with carbon steel. Thermogravimetric analyzer (TGA) is used to simulate isothermal oxidation process of Fe-1.5 Si alloy for 60 min under air condition, and the temperature range is from 700 to 1200 C. Electron probe microanalysis (EPMA) is used to observe cross-sectional scale morphology and analyze elemental distribution of the scale. Relational graph of temperature, scale thickness and scale structure is obtained. It is found that scale structure (outer Fe oxide layer+ inner FeO/Fe 2 SiO 4 layer+ internal Si oxide precipitates) is almost unchanged with temperature except at 1000 and 1200 C. At 1000 C internal Si oxide precipitates cannot be found at the subsurface of the alloy, and at 1 200 C FeO/Fe 2 SiO 4 not only forms a layer as usual but also penetrates into the outer Fe oxide layer deeply.
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