heat treatment - a process which may include several steps involving the heating and cooling of a metal or alloy. The purpose of heat treating is to obtain certain desired properties in the product, such as ductility, hardness, or toughness. The metal is not melted during treating, and both the rate and conditions of heating and cooling, as well as the time that the material is held at any temperature, must be carefully regulated., termiline töötlemine - metalli (sulami) struktuuri (seega ka omadusi) muutev koondoperatsioon, mis seisneb metalli kuumutamises mingi kindla t°-ni, sellel t°-l hoidmises ja ettenähtud kiirusega jahutamises