How can you tell the difference between two parts made of the same metal, one shaped by cold working and the other by hot working

The difference between the two point is due to their "LATENT HEAT", which is caused by the size of particles of that metal substance in each side of the metal

Explanation: Latent heat is the amount of heat energy a substance can give out in an isotropic system (constant temperature). This is why we see a stainless plate more cold than an iron, when both are under same temperature. This difference in latent heat of any substance is because of the particle size of the substance.

For a metal parts to have differents latent energy, is due to the way the metal shape is formed. Let's take iron for instance, which has different forms, as cast iron and wrought iron. An object made of iron may be formed as cast iron at one end and wrought iron at the other end, which will make the two different end to have differents latent energy, the wrought iron part which particles are more smaller will hot more than the cast iron part which particles are more larger.

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