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← TechnologyWhich defect increases when core shift occurs during investment casting?
A)Wall thickness variation exceeding tolerances✓
B)Elevated graphite nodule count, decreased strength
C)Increased hydrogen population, metal distortion
D)Formation of primary carbide precipitates (dendrites)
💡 Explanation
Wall thickness variation increases due to inaccurate positioning via the coring stage, because core shift alters molten metal deposition during solidification impacting dimensional control. It is therefore a dimensional tolerance failure, rather than a metallurgical or chemical deviation.
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