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← TechnologyWhich outcome occurs when a sand casting mold is inadequately vented during molten nickel alloy pouring?
A)Increased porosity within the casting✓
B)Microstructure refines grain boundary carbides
C)Improved alloy ductility at high temperatures
D)Enhanced corrosion resistance in chloride solutions
💡 Explanation
Increased porosity results within castings because undissolved gasses cannot escape, initiating the mechanism of gas entrapment. Therefore, porosity increases rather than improving alloy properties; proper venting would allow gas escape, minimizing defects.
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