Comparison between Full Hardening and Case Hardening

 

COMPARISON BETWEEN FULL HARDENING AND CASE HARDENING


  Comparison between Full Hardening and Case Hardening

S.No.

Full Hardening

Case Hardening

1

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.

2

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).

3

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.

4

Hardening is
always followed by tempering to increase its usefulness.

Case
hardening is not always followed by tempering.

5

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.
always.

6

It is a cheap
and fast process.

It is costly
and time consuming process.

 

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