An Overview of Heat Treatment Solutions
The procedure of heat treatment involves controlled heating and then cooling the metals so as to change their physical and mechanical properties without altering their shapes. In a few cases, this process is done inadvertently as a result of the manufacturing approach which could either heat up or cool the metal like welding or forming. Below are some heat treatment solutions so as to grow your knowledge.
Annealing is a method of steel heating and maintaining the temperature of the material at a specific temperature by cooling it down to a suitable rate. This increases features such as the machinability, softness and cold working attributes of the steel and even helps in removing the stresses of the material and thus it obtains the right structure. In full annealing, the material is heating to a temp where the carbide turns into a solution completely or in part and then is cooled down. Sub critical annealing takes place at a temperature that is a bit lower than the temperature where the carbide starts tuning into a solution.
Structural changes are as a result of the ageing process. This usually takes place in definite metals and alloys at high temperatures or atmospheric temperature. Ageing has different effects; proof stress, hardness values and maximum stress increase while the ductility goes down. There are specific conditions where ageing is achieved through heating at a high temperature. This is usually referred to as artificial ageing and its result is precipitation hardening.
Carburizing is a process that involves introducing carbon into the surface layer of the steel which does not have a high carbon content. It could be effected by heating it inside a liquid, gaseous or solid medium that has carbon. When conducted in high temperatures, it offers a supply of carbon which the carburized substance supplies. The concentration of the carbon and the depth in its steel surfaces is varied by controlling the temperature and the time which the heat treatment requires.
Hardening is a process which uses heat treatment to harden the material. Normally, this implies heating to a temperature which is more than the critical range by maintaining the temperature at a range where diffusion will be achieved by quenching in air, oil or water.
In the induction hardening procedure, the steel is hardened through heat treat. It is done by alternating a magnetic field to that of the temperature which is above or close to the transformation range then quenching follows it.
Normalizing is a heat treatment method in which heating to is done and when required, even maintaining the temperature at a certain level and then cooling down the cool air follows. The purpose of this is to facilitate faster cooling at a medium level.