High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres
Using a thermogravimetric analyzer (TGA), Fe–10Cr steel was oxidized in dry air and in a mixed atmosphere of air and water vapor at a relative humidity of 50% and a temperature of 800–1200 °C for 1 h. The oxidation weight gain curves under the two atmospheres were drawn, the oxidation activation ene...
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doaj-31cad91fc0bd47c299e7b258a22d7a082021-07-15T15:40:05ZengMDPI AGMaterials1996-19442021-06-01143453345310.3390/ma14133453High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different AtmospheresLei Cheng0Bin Sun1Chongyang Du2Wei Gao3Guangming Cao4School of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Mechanical Engineering, Shenyang University, 21 Wanghua South Street, Shenyang 110044, ChinaSchool of Materials Science and Engineering, Sun Yat-sen University, 135 Xingang West Road, Guangzhou 510000, ChinaState Key Laboratory of Rolling and Automation, Northeastern University, 11 Wenhua Road, Shenyang 110819, ChinaUsing a thermogravimetric analyzer (TGA), Fe–10Cr steel was oxidized in dry air and in a mixed atmosphere of air and water vapor at a relative humidity of 50% and a temperature of 800–1200 °C for 1 h. The oxidation weight gain curves under the two atmospheres were drawn, the oxidation activation energy was calculated, and the phase and cross-sectional morphology of the iron oxide scales were analyzed and observed by X-ray diffractometry (XRD) and optical microscopy (OM). The results showed that when the oxidation temperature was 800 °C, the spheroidization of Fe–10Cr steel occurred, and the oxidation kinetics conformed to the linear law. At 900–1200 °C, the oxidation kinetics followed a linear law in the preliminary stage and a parabolic law in the middle and late stages. In an air atmosphere, when the oxidation temperature reached 1200 °C, Cr<sub>2</sub>O<sub>3</sub> in the inner oxide layer was partially ruptured. In an atmosphere with a water vapor content of 50%, Cr<sub>2</sub>O<sub>3</sub> at the interface reacted with H<sub>2</sub>O to generate volatile CrO<sub>2</sub>(OH)<sub>2</sub>, resulting in a large consumption of Cr at the interface. At the same time, a large number of voids and microcracks appeared in the iron oxide layer, which accelerated the entry of water molecules into the substrate, as well as the oxidation of Fe–10Cr steel, and caused the iron oxide scales to fall off. Due to the volatilization of Cr<sub>2</sub>O<sub>3</sub> and the conversion from internal oxidation to external oxidation, the internal oxidation zone (IOZ) of Fe–10Cr steel under water vapor atmosphere decreased or even disappeared.https://www.mdpi.com/1996-1944/14/13/3453Fe–10Cr steelCr oxideoxidation kineticsoxide scale |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Cheng Bin Sun Chongyang Du Wei Gao Guangming Cao |
spellingShingle |
Lei Cheng Bin Sun Chongyang Du Wei Gao Guangming Cao High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres Materials Fe–10Cr steel Cr oxide oxidation kinetics oxide scale |
author_facet |
Lei Cheng Bin Sun Chongyang Du Wei Gao Guangming Cao |
author_sort |
Lei Cheng |
title |
High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres |
title_short |
High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres |
title_full |
High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres |
title_fullStr |
High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres |
title_full_unstemmed |
High-Temperature Oxidation Behavior of Fe–10Cr Steel under Different Atmospheres |
title_sort |
high-temperature oxidation behavior of fe–10cr steel under different atmospheres |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-06-01 |
description |
Using a thermogravimetric analyzer (TGA), Fe–10Cr steel was oxidized in dry air and in a mixed atmosphere of air and water vapor at a relative humidity of 50% and a temperature of 800–1200 °C for 1 h. The oxidation weight gain curves under the two atmospheres were drawn, the oxidation activation energy was calculated, and the phase and cross-sectional morphology of the iron oxide scales were analyzed and observed by X-ray diffractometry (XRD) and optical microscopy (OM). The results showed that when the oxidation temperature was 800 °C, the spheroidization of Fe–10Cr steel occurred, and the oxidation kinetics conformed to the linear law. At 900–1200 °C, the oxidation kinetics followed a linear law in the preliminary stage and a parabolic law in the middle and late stages. In an air atmosphere, when the oxidation temperature reached 1200 °C, Cr<sub>2</sub>O<sub>3</sub> in the inner oxide layer was partially ruptured. In an atmosphere with a water vapor content of 50%, Cr<sub>2</sub>O<sub>3</sub> at the interface reacted with H<sub>2</sub>O to generate volatile CrO<sub>2</sub>(OH)<sub>2</sub>, resulting in a large consumption of Cr at the interface. At the same time, a large number of voids and microcracks appeared in the iron oxide layer, which accelerated the entry of water molecules into the substrate, as well as the oxidation of Fe–10Cr steel, and caused the iron oxide scales to fall off. Due to the volatilization of Cr<sub>2</sub>O<sub>3</sub> and the conversion from internal oxidation to external oxidation, the internal oxidation zone (IOZ) of Fe–10Cr steel under water vapor atmosphere decreased or even disappeared. |
topic |
Fe–10Cr steel Cr oxide oxidation kinetics oxide scale |
url |
https://www.mdpi.com/1996-1944/14/13/3453 |
work_keys_str_mv |
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