heat treatment

Heat Treatment

Heat treating or heat treatment is a industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material.

The most common application is metallurgical.

Heat treatments are also used in the manufacture of many other materials, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, carburizing, normalizing and quenching.

It is noteworthy that while the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding.

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Description

Heat Treatment:

Heat treatment is a industrial and metalworking processes.

They are also used in the manufacture of many other materials. To make the materials hardened or soft. Hence process can be include hardening, strengthening, tempering, normalizing and quenching.

It has three basic steps:  Heating, soaking, and cooling.

General:

Metallic items consist of a micro structure of small crystals called “grains”. The nature of the grains is one of the most effective factors. The temperature of metals are heated, and the rate of cooling after heat treatment can change properties of metal. The most common reasons that metals undergo in heat treatment is to improve their strength, hardness, toughness, and corrosion resistance.

Tempering:

It is a process of heat treating. Hence is used to increase the toughness of iron. It is usually performed after hardening. To reduce some of the excess hardness, which is done by heating the metal at low temperature  and then make it to cool in the air. It depends on both the specific composition of the alloy and the finished product. At low temperatures hard tools are tempered. Because springs are tempered at much high temperatures.

 

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