Study on Inclusions in Ductile Cast Iron

Wen Tao Guo; Guo Wei Chang; Shu Ying Chen; Ji Chao Wang

doi:10.4028/www.scientific.net/AMR.299-300.273

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In Situ Observation of Solidification Behavior in a Q235 Steel by Using Electric Pulse Modification
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Study on Inclusions in Ductile Cast Iron
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 299-300Study on Inclusions in Ductile Cast Iron

Study on Inclusions in Ductile Cast Iron

Abstract:

The type, shape and distribution of inclusions in ductile cast iron were studied using a scanning electron microscopy (SEM) and the energy spectrum analysis, combining the thermodynamic calculation of inclusions formation. The results show that the oxides are most likely formed from the thermodynamics in ductile cast iron when the temperature is 1373~1873 K , followed by the sulfides, the carbides again. There exist the uniphase inclusions MgO, SiO₂ and MgS, the heterogeneous inclusions of containing rare-earth MnO-MgO-SiO₂-La₂O₃ and MgS-LaS-SiO₂-Al₂O₃-MgO , and the heterogeneous inclusions of non-rare earth SiO₂-MnO-MgO-Al₂O₃ in ductile cast iron. The shapes of the inclusions are mainly polygon, and the size variation is from 3 to 10 um. The inclusions are mainly distributed on the graphite ball surfaces, the ferrite grain boundaries and in the pearlites.