. I was happy to learn … Heating and cooling curves are generally used in the manufacture of steel. It is used in heat treatment. Different heating and cooling rates gives the steels of different properties for the formation of dendrites formed at different speeds. Rapid cooling gives smaller dendrites. These curves are also used to relieve stress steel and welds where the weld area has been affected structurally by the heat effected zone. Welds are relieved to avoid stress fractures forming later stress.
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