| 氧化时间及铬含量对Fe-Cr钢高温氧化行为的影响 |
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| 引用本文： | 程磊,孙彬,高炜,杜重洋.氧化时间及铬含量对Fe-Cr钢高温氧化行为的影响[J].金属热处理,2021,46(7):65-71. |
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| 作者姓名： | 程磊 孙彬 高炜 杜重洋 |
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| 作者单位： | 1.沈阳大学 机械工程学院, 辽宁 沈阳 110044; 2.中山大学 材料学院, 广东 广州 510000 |
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| 基金项目： | 国家自然科学基金青年基金(51301111);辽宁省自然科学基金(2019-KF-05-04);沈阳市中青年科技创新人才支持计划(RC200387);轧制技术及连轧自动化国家重点实验室开放课题基金(2017RALKFKT007) |
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| 摘 要： | 为了测定不同氧化时间以及铬含量对高温条件下钢材表面氧化铁皮组织和厚度的影响,将Fe-5Cr钢与Fe-10Cr钢在1000 ℃空气条件下氧化60~180 min,采用增重法绘制其氧化动力学曲线,并利用光学显微镜、能谱仪和X射线衍射仪对氧化铁皮的断面形貌和物相进行研究。结果表明,两试验钢氧化初期为“气-固”反应,中后期为“气相-氧化铁皮-固相”反应。两试验钢氧化铁皮结构均由外氧化层、内氧化层和内氧化区域组成。当氧化时间为180 min时,Fe-10Cr钢检测到了内氧化物Cr2O3。空气中氧元素向内扩散与基体中铬元素发生反应生成内氧化物Cr2O3,再与氧化铁皮层中的FeO发生固相反应生成尖晶石结构产物FeCr2O4。随着氧化时间的增加,由于内氧化物Cr2O3不断受到内氧化层的包裹而转为外氧化,内外氧化的转变使得基体不断被腐蚀,氧化铁皮厚度不断增加。
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| 关 键 词： | Fe-Cr钢 高温氧化 氧化动力学 氧化铁皮 氧化时间 |
| 收稿时间： | 2021-03-24 |
Effect of oxidation time and chromium content on high temperature oxidation behavior of Fe-Cr steel |
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| Cheng Lei,Sun Bin,Gao Wei,Du Chongyang.Effect of oxidation time and chromium content on high temperature oxidation behavior of Fe-Cr steel[J].Heat Treatment of Metals,2021,46(7):65-71. |
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| Authors: | Cheng Lei Sun Bin Gao Wei Du Chongyang |
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| Affiliation: | 1. Mechanical Engineering Institute, Shenyang University, Shenyang Liaoning 110044, China; 2. School of Materials, Sun Yat-sen University, Guangzhou Guangdong 510000, China |
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| Abstract: | In order to determine the effect of different oxidation time and chromium content on microstructure and thickness of the iron oxide scale on steel surface at high temperature, Fe-5Cr steel and Fe-10Cr steel were oxidized at 1000 ℃ under air condition for 60-180 min. The oxidation kinetics curves of this two tested steels were drawn by using mass gain method, and the cross-section morphologies and phases of the steel scales were studied by means of metallographic microscope, energy spectrum and X-ray diffractometer. The results show that the oxidation of two steels is a “gas-solid” reaction in the early stage, and is a “gas phase-iron oxide scale-solid phase” reaction in the middle and late stages. The structure of the oxide scale is composed of outer oxide layer, inner oxide layer and inner oxide zone. When the oxidation time is 180 min, the internal oxide Cr2O3 is detected in the Fe-10Cr steel. The oxygen in the air diffuses inward and reacts with chromium in the substrate to produce internal oxide Cr2O3, which reacts with FeO in the iron oxide to produce spinel structure product FeCr2O4. With the increase of oxidation time, the internal oxide Cr2O3 is continuously wrapped by the internal oxide layer and converted to external oxidation. The transformation of internal and external oxidation causes the substrate to be continuously corroded, and the thickness of the iron oxide scale continues to increase. |
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| Keywords: | Fe-Cr steel high temperature oxidation oxidation kinetics iron oxide scale oxidation time |
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