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Research on the Oxidation Mechanism of Vermicular Graphite Cast Iron
Qiaoqin Guo1, Zhong Yang2, Ding Guo3
1School of material and chemical engineering, Xi'an Technological University, Xi'an 710032, China. guoxatu@xatu.edu.cn.
Abstract:
The oxidation mechanism of vermicular graphite cast iron was studied. The oxidation reaction starts from graphites and diffused slowly. Graphites in vermicular graphite are interconnected, coral-like clusters, providing the main oxidation core and channel. The worm-like graphites on the surface are mostly oxidized and form oxide affected zones. The oxide films are composed of a loose oxide layer with the phases of Fe3O4, Fe2O3, and FeO, and a dense passivation layer with FeO and Fe2SiO4. After oxidation, pearlites in the vermicular graphite cast iron are decomposed into ferrite and cementite at high temperatures.
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