What is the drawback of hot forging compared to cold forging?
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A.
Increased hardness of the final product
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B.
Reduced ductility of the material
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C.
Poor surface finish and lower dimensional accuracy
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D.
Increased residual stresses
Correct Answer:
C. Poor surface finish and lower dimensional accuracy
Explanation:
Hot forging involves heating metal above its recrystallization temperature, which leads to the formation of surface scale due to oxidation. This process results in a rougher surface finish and less precise dimensional control compared to cold forging, where the material is worked at room temperature. While hot forging improves ductility and reduces internal stresses, the requirement for cooling and the presence of oxidation layers make it difficult to achieve the tight tolerances and smooth surfaces characteristic of cold-worked parts.
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