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Full Paper
Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact
Article first published online: 4 JUN 2012
DOI: 10.1002/srin.201200054
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Additional Information
How to Cite
Wang, H. and Sohn, H. Y. (2012), Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact. steel research int., 83: 903–909. doi: 10.1002/srin.201200054
Publication History
- Issue published online: 4 SEP 2012
- Article first published online: 4 JUN 2012
- Manuscript Received: 12 MAR 2012
- Abstract
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Keywords:
- catastrophic swelling;
- iron oxide;
- reducing gas;
- reduction;
- whiskers
Abstract
The effects of different types of reducing gas on swelling and iron whisker formation during the reduction of iron oxide compacts were investigated. The compacts sintered in air at 1273 K were reduced at 1173 K in different reducing atmospheres. The results indicated that catastrophic swelling can happen in CO but not when H2 is present in the reducing gas mixture. Scanning electron microscope (SEM) micrographs showed that catastrophic swelling was caused by a large amount of long iron whiskers formed during the reduction. The presence of N2 and CO2 in CO changed the amount of long iron whiskers and its distribution, which determined the extent of swelling.