THE CASTINGS HAVE LARGE GRAINS, AND I WILL GIVE YOU SOME PRACTICAL SUGGESTIONS!
If the cross-section difference of the casting is too large, the thicker cross-section will cool slowly and cause the coarse grains there. Metals, such as gray cast iron, which are very sensitive to cross-sectional changes, are more likely to produce such defects. An effective way to prevent such defects is to avoid excessive disparity in the cross-sectional dimensions of castings, but this approach is sometimes beyond the reach of foundry workers.
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