What types of defect create from primary and secondary cooling

Question

Accepted Answer

Defects in primary and secondary cooling can lead to various types of issues in the final product.

Primary cooling defects include shrinkage, porosity, and hot tears.
Secondary cooling defects include cracks, segregation, and inclusions.
Shrinkage occurs when the metal solidifies and contracts, leaving voids in the final product.
Porosity is caused by gas bubbles getting trapped in the metal during solidification.
Hot tears occur when the metal cools unevenly and cracks form due to internal stresses.
Cracks can form during secondary cooling due to thermal stresses or improper cooling rates.
Segregation happens when the composition of the metal is not uniform throughout the casting.
Inclusions are foreign particles that get trapped in the metal during the casting process.

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