Blossary – Heat Treatment

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Heat Treatment is the controlled heating and cooling of metals to alter their physical and mechanical properties without changing the product shape. Heat treatment is sometimes done inadvertently due to manufacturing processes that either heat or cool the metal such as welding or forming. Heat Treatment is often associated with increasing the strength of material, but it can also be used to alter certain manufacturability objectives such as improve machining, improve formability, restore ductility after a cold working operation. Thus it is a very enabling manufacturing process that can not only help other manufacturing process, but can also improve product performance by increasing strength or other desirable characteristics.

Category: Engineering

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Created by: Naveed

Number of Blossarys: 5

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Patenting

The special heat treatment given to medium carbon,high carbon and low alloy steels wire rod is called patenting.The process consists of heating the material well above the austenizing temperature to ...

Martempering

Martempering involve heating the steal to the austenitizing temperature, followed by quenching in a constant temperature bath maintained above Ms point and the usual temperature of bath lies between ...

Tempering

A process,which consists of heating hardened steel below the lower critical temperature,followed by cooling in air or at any desired rate,is known as tempering.

Hardening

Hardening treatment consists of heating to hardening temperature,holding at that temperature followed by rapid cooling such as quenching in water,oil or salt baths.

Normalizing

Normalizing is a process of heating steel to about 40 to 50 degree above upper critical temperature,holding for proper time,and then cooling in still air or at room temperature.

Spheroidizing

Spheroidizing is a heat treatment process which results in a structure consisting of globules or spheroids of carbide in matrix of ferrite.

Process Annealing

In this treatment,steel is heated to a temperature below the lower critical temperature,and is held at this temperature for sufficient time and then cooled.