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Effects of Reducing Gas on Swelling and Iron Whisker Formation during the Reduction of Iron Oxide Compact
Authors:Haitao Wang  Hong Yong Sohn
Affiliation:Department of Metallurgical Engineering, University of Utah, Salt Lake City, Utah 84112, USA
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.
Keywords:catastrophic swelling  iron oxide  reducing gas  reduction  whiskers
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