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← TechnologyWhich risk increases when investment casting employs insufficient vacuum degassing?
A)Elevated precipitate formation rates
B)Heightened susceptibility to hydrogen embrittlement
C)Increased internal porosity defects✓
D)Accelerated thermal conductance degradation
💡 Explanation
Increased internal porosity arises because incomplete vacuum degassing leaves dissolved gases in the molten metal, which then precipitates as voids during solidification. Therefore, internal porosity rises rather than a faster rate of precipitate formation because those precipitates remain solid.
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