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In the hot working of materials, porosity may increase in the material rather than decrease.

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in Casting-Forming-Welding II by (119k points)
In the hot working of materials, porosity may increase in the material rather than decrease.

(a) True

(b) False

The question was posed to me in an online interview.

Query is from Advantage and Disadvantage of Hot and Cold Forming topic in section Types of Die & Metal Forming Processes of Casting-Forming-Welding II

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Correct choice is (b) False

The explanation is: In the hot working of materials, the porosity always decreases and reaches to negligible amount in the material. The high temperature of the material makes dynamic changes in the material and the gases entrapped in the material loses out and vapourized due to the high temperature of material. This minimizes the amount of porosity in the material.

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