Hot tears are the result of which of
the following?
Lower permeability
Lower green strength
More fins
Restraint of contraction
Restraint of contraction
Hot tears are the result of restraint
of contraction.
●A crack that develops in a casting
due to high residual stresses is called a hot tear.
●Hot tears happens because of weak metal,
when it is hot and the residual stresses in the material can cause the casting
to fail as it cools.
●Proper mould design can prevents this type of defect.
Hence, the correct option is (D).
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