I'm wondering which type of casting defect has happened and what are remedies?
Could be a mis run, or some trapped air that prevented full wetting on the mould.
I think about cold shot due to molten metal surface oxidation plus lacking of flowability due to low temperature and high magnesium content? Does that seem reasonible?
Dear Mohammad Farshbaf Ahmadipour,
The problem is known - the presence of a defect in the surface. This type of defect is typical in the following cases: - Presence of moisture in the mold; - poor adaptation of the vomit; - poor separation of air and gases from the mold; - lack of sufficient channels for removal of air and gases from the mold; - low hydrostatic pressure during casting; - low casting temperature unlikely but not switched off; - basket thinness of the metal due to loss of chemical elements or low casting temperature; and other. Nebivadase also turns off the temperature of the heated mold, it has a strong influence on the quality of the casting.
Just by visual observation, it could originate either from poor mold surface adhesion with the mold especially in case sand casting or from gas entrapment within the mold prior to casting. I think mildly polishing the surface of the sample will help to improve the surface finish.
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