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Differences between Full Hardening and Case Hardening.

written 2.8 years ago by Krishna_Agrawal • 2.7k

•   modified 2.8 years ago

Differences between Full Hardening and Case Hardening.

manufacturing process

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written 2.8 years ago by Krishna_Agrawal • 2.7k

•   modified 2.8 years ago

Full Hardening	Case Hardening
It is process carried out on steel parts to resist wear or abrasion and in case of cutting tools to improve their cutting ability.	The main objective of case- hardening of steel parts is to have a hard surface and tough core. The various methods are, carburizing, cyaniding, nitriding, flame hardening and induction hardening.
In this process, the structure formed of materials and whole of the part is effected.	In this process, the only outer surface (up to some depth) is saturated by carbon, nitrogen or both. Where core is not affected (remains tough).
Its main purpose is to resist wear and increase the cutting ability.	Its main purpose is get outer surface hard where inner core is kept tough. It is used to obtain close tolerances on machine parts, higher fatigue limit and high mechanical properties in core of the metal part.
Hardening is always followed by tempering to increase its usefulness.	Case hardening is not always followed by tempering.
In hardening the metals are heated above critical temperature and then cooled rapidly.	In case hardening, the metals are heated obut it not necessary to cool them rapidly.
It is a cheap and fast process.	It is costly and time consuming process.

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