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Indexed by:期刊论文

Date of Publication:2010-02-01

Journal:JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL

Included Journals:SCIE

Volume:17

Issue:2

Page Number:27-30

ISSN No.:1006-706X

Key Words:compressive stress; oxide scale; wustite; magnetite; cooling

Abstract:The microstructure development of oxide scale on pure iron under the mutual action of compressive stress and cooling conditions was investigated. Oxide scale structure was examined by optical microscopy (OM) and scanning electron microscopy (SEM). It was found that oxide scale formed under normal cooling conditions had a structure mainly consisting of an outer magnetite and an inner wustite layer. When a compressive stress was applied, numerous magnetite precipitates formed within wustite layer homogeneously at starting cooling temperature of 900 degrees C, and the wustite layer in the scale was transformed into a mixture of mostly magnetite/iron eutectoid and magnetite layer at starting cooling temperature of 700 degrees C. The wustite decomposition and precipitation of magnetite in wustite under compressive stress were discussed.