Differentiate Hardening and Tempering of Automobile Parts.

Differentiate Hardening and Tempering of Automobile Parts.
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1 Answer

Answer :

Differentiate Hardening and Tempering:

Parameter
Hardening
Tempering
Definition
Hardening or quenching is the process of increasing the hardness of a material.
Tempering is the process of heating a substance to a temperature below its critical range, holding and then cooling.
Process
In hardening process, the metal is heated into austenitic crystal phase and then quickly cooled.
Tempering is done by re-heating the metal alloy to a temperature lower than the critical temperature, holding for some time and cooling.
Purpose Hardening increases the hardness and strength of materials such as metal alloys.
Tempering reduces hardness & strength of steel
Application
hardening is done to increase the hardness of a metal
tempering is done to reduce the brittleness of quenched metal or alloy.
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