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| Comparison of decarburization of Fe-C alloy strips in CO2 and H2O atmosphere |
| ZHOU Mei-jie1, AI Li-qun1, HONG Lu-kuo1, LI Ya-qiang2, SUN Cai-jiao1, HOU Yao-bin1 |
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China;
2. Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract In order to investigate the decarburization behaviour of Fe-C alloy in CO2and H2O, the Fe-C alloy strips with a carbon content of about 4.2% were decarburized in Ar-CO-CO2and Ar-H2-H2O atmospheres respectively. The atmospheric conditions that ensure the strips can be decarburized but iron not be oxidized were made by combining thermodynamic analysis and tests. The atmospheric conditions of the Ar-CO-CO2 atmosphere were gas flow rate of 850 mL/min, mass percent of CO of 25%, $P_{CO_2}$/(PCO+$P_{CO_2}$) = 0.26. The atmospheric conditions of the Ar-H2-H2O were gas flow rate of 500 mL/min, mass percent of H2 of 15%, water bath temperature of 313 K. The average mass percent of carbon was 0.6% after 50 min at 1 413 K in Ar-H2-H2O. The average mass percent of carbon was 0.92% after 70 min at 1 413 K in Ar-CO-CO2. The decarburization effect of Ar-H2-H2O was better than that of Ar-CO-CO2 at the same decarburization time and temperature. The reason is that the carbon activity of the strips in Ar-H2-H2O is lower than that of the Ar-CO-CO2 atmosphere when the decarburization reaction is in equilibrium. As a result, the carbon concentration gradient of Fe-C alloy strips in Ar-H2-H2O is higher than Ar-CO-CO2. And the diffusion flux in Ar-H2-H2O is higher than Ar-CO-CO2.
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Received: 17 August 2020
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2021, Vol. 56 
