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← TechnologyWhich defect occurs in investment casting if slurry temperature is mismatched?
A)Shell cracking during burnout✓
B)Increased alloy solidification rate
C)Enhanced binder oxidation process
D)Refractory mold densification occurs
💡 Explanation
Shell cracking during burnout results because differential thermal expansion strains exceed the shell's tensile strength, due to inadequate binder flexibility. Therefore, the shell fractures, rather than successfully containing expansion, because thermal gradients are too steep.
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