IN SITU OBSERVATIONS OF MICROSTRUCTURAL AND MORPHOLOGICCAL CHANGES OF THE REDUCTION PRODUCT OF MAGNETITE IN  H_2/Ar GAS MIXTURES

Acta Metall Sin

1998, Vol. 34

Issue (6): 571-578 DOI:

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IN SITU OBSERVATIONS OF MICROSTRUCTURAL AND MORPHOLOGICCAL CHANGES OF THE REDUCTION PRODUCT OF MAGNETITE IN H_2/Ar GAS MIXTURES

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WANG Yarong; LI Jiguang; ZHAO Guojun; XU Lixian; LI Yintai(School of Materials and Metallurgy; Northeastern University; Shenyang 110006)(School of Sources and Civil Engineering; Northeaster University; Shenyang 110016)Comspondent: LI Yintai; professor ; Tel: (024)3914717 Fax (024)3890559. IN SITU OBSERVATIONS OF MICROSTRUCTURAL AND MORPHOLOGICCAL CHANGES OF THE REDUCTION PRODUCT OF MAGNETITE IN H_2/Ar GAS MIXTURES. Acta Metall Sin, 1998, 34(6): 571-578.

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Abstract The microstructural changes occurring on the surface of magnetite samples in H2/Ar gas mixture have been directly recorded using an optical heating stage technique, and the nucleation, growth model and growth rate of iron nuclei under different reduction conditions were discussed. The results show that in the temperature range of 773 -- 1373 K, four kinds of nucleus morphologies and growth models with different characteristics were observed tinder different reduction conditions. Morphology transformation and average growth rate of iron nuclei were found to be closely related to temperature and hydrogen partial pressure.

Key words: magnetite reduction microstructure morphology

Received: 18 June 1998

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1998/V34/I6/571

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