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← TechnologyWhich consequence results when residual shell material remains during investment casting?
A)Increased surface porosity flaws✓
B)Lower section fatigue tolerance
C)Dimensional shrinkage is improved
D)Better high temperature tensile resistance
💡 Explanation
Increased surface porosity occurs because the shell fragments inhibit complete metal flow during solidification. This "Slag entrapment" defects surface integrity; therefore porosity results, rather than improved casting dimensions given unobstructed flow.
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