Observation of Inclusion Defects in Grey Iron Castings

21 Mar.,2023

 

The company has a group of cooperation teams engaged in the grey iron casting company industry for many years, with dedication, innovation spirit and service awareness, and has established a sound quality control and management system to ensure product quality.

Abstract

  Sand and slag inclusion defects in grey iron castings were examined by using a metallographic microscope and an electron probe microanalyser. The sources of these defects were studied by field examinations on casting production. The relation between the microstructures and the sources were investigated. The results obtained were as follows:  (1) Sand inclusion defects were found to be resulting from complex silicate reactants combined with entrapped iron particles and sand grains. The reactants consisted of Mn-silicate (MnO⋅SiO2 or 2MnO⋅SiO2), cristobalite and MnO-SiO2-Al2O3 eutectic compounds.  (2) Slag inclusion defects were found to be glassy reactants combined with entrapped iron particles and gas holes. The reactants consisted of SiO2 and small amounts of Al2O3-CaO-MnO. Another type of these defects was found to be due to undissolved Fe-Si particles and graphite.  (3) Defects due to peeling of mold coatings were found to be caused by reactants combined with entrapped iron particles and Al2O3 particles. The reactants consisted of FeO-MnO-SiO2-Al2O3 eutectic of fine structure. These defects were often associated with sand inclusion and they showed structural features of both sand and slag inclusions.

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