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Heating Metal Affects Properties (One)

Source: | Updated: Jul 04, 2016

Heat can change metal's electrical, magnetic and structural properties. Cause the applications of metal are differ from each other, different environments results different qualities. For instance, in engineering applications, toughness is desired; in electrical applications, low electrical resistivity is important.

As we knows, there are plenty of ways of heating metal which are often used to transform these properties. The temperature to which the metal is heated and the rate of cooling are need to be carefully controlled for achieving the desired outcome.

The Effect of Mental by Heat

The four most important ways that metals are transformed through heat as following:

1、Electrical resistance

Electrical resistance is the measure of how strongly the metal impedes the passage of electrical current. When electrons pass through the metal, they scatter as they collide with the metallic structure. As the metal is heated, the electrons will absorb more energy and it will move faster than before. This leads to more scattering, thus increasing the amount of resistance. Thermometers actually use the change in electrical resistance in a piece of wire to measure temperature.

2、Thermal Expansion

Metal expands when heated. Length, surface area and volume will increase with temperature. The scientific term for this is thermal expansion. The degree of thermal expansion varies with different types of metal. Thermal expansion occurs because heat increases the vibrations of the atoms in the metal. Accounting for thermal expansion is essential when designing metallic structures. An everyday example would be the design of household pipes, which must accommodate expansion and contraction as the seasons change.

3、Structure

Metals are comprised of a symmetrical structure of atoms called as an allotrope. Heating the metal will displace atoms from their position and the displaced atoms form a new structure. This process is known as allotropic phase transformation. Allotropic phase transformation alters the hardness, strength and ductility of the metal. The most important allotropic phase transformation is undergone by iron. When iron is heated past 1,674 degrees Fahrenheit it is able to absorb more carbon, which is an ingredient that will increase the hardness of any steel product

4、Magnetism

There are three metals with magnetic properties: iron, nickel and cobalt. They are ferromagnetic metals. Heating these metals will reduce their magnetization to the point where magnetism is completely eradicated. The temperature at which this occurs is known as the Curie temperature. For nickel, this temperature is 626 degrees Fahrenheit; for cobalt it is 2,012 degrees Fahrenheit; and for Iron it is 1,418 degrees Fahrenheit.

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