Metallurgy Interview Question:

Which method has more procity in cast part? Which method has more strength in cast part?

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The sand casting will have more porosity in the final product. The die cast will also have higher strength both because of the lower degree of porosity and because of the finer grain size. While I have not been directly involved in the production of cylinder blocks there are a number of reasons for the preference of die-casting versus sand casting. Die-casting provided a finer finish, greater tolerance, better repeatability, and generally higher quality casting. They used sand casting of the iron blocks and still do in many cases and initially the used this same method for aluminum. However, the lower melting point of aluminum allows them to do the die casting method.
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