salah satu proses nitriding

1. Nama : Eldayadi Nefty R A
2613101011
Heat treatment

2. Nitriding
nitriding surface hardening is a process with
nitrogen to the surface elements of difusion
solution on metal/steel and cast iron feritik, by
means of heating and holding the metal/steel and
cast iron at temperatures below the critical
temperature (between 500-590oC),for a period of
time in contact with a gas or liquid nitrogen.
The entire steel and cast iron which can
be hardened and hard, must be in temper before
nitriding process is done, where the temperature of
the tempering should be high enough to maintain
the stability of the structure of nitriding processes
(nitriding temperature 100C above the minimum).

3. Application Factors
Principal reasons for nitriding
are:
 To obtain high surface hardness
 To increase wear resistance and antigalling
properties
 to improve fatigue life
 To improve corrosion resistance (except for
stainless steels)
 To obtain a surface that is resistant to the softening
effect of heat at temperatures up to the nitriding
temperature

4. Introduction
 GAS NITRIDING is a case-hardening process whereby
nitrogen is introduced into the surface of a solid ferrous
alloy by holding the metal at a suitable temperature
(below Ac1, for ferritic steels) in contact with a
nitrogenous gas, usually ammonia. Quenching is not
required for the production of a hard case. The nitriding
temperature for all steels is between 495 and 565 C.
The nitrogen source is usually Ammonia (NH3). At
the nitriding temperature the ammonia dissociates
into Nitrogen and Hydrogen.
2NH3 ---> 2N + 3H2

5. Furnace and The nitrogen diffuses into the steel and
hydrogen is exhausted. A typical nitriding setup is illustrated
in Figure .

7. Area Temperatur nitriding pada diagram fasa

9. Data
12 hours -> 0.12 to 0.20 mm
24 hours -> 0.20 to 0.28 mm
48 hours -> 0.28 to 0.38 mm
72 hours -> 0.39 to 0.53 mm

10. White layer thickness may vary between 0.012 and 0.20 centimetre.
which depends on nitriding time. The most commonly nitrided steels
are chromium-molybdenum alloy steels and Nitralloys. Surface
hardnesses of 55 HRC to 70 HRC can be achieved with case depths
varying from 0.005 in to 0.020 in. Nitrided steels are very hard .

11. product
Engine components for motorcycle, others :
-steering gears
-cylinder heads
-cylinder liners
machine tools, other :
- cutting tools (high speed steel)
- rolling tools
- drawing tools

12. conclusion
- The process of hardening of the toughest
among other processes.
- longer the addition of ammonia, the thicker
layers hardness on metal surfaces.
- All that's good nitriding process for hardening
the steel surface, corrosion resistance and
other mechanical properties, but nitriding
process using ammonia gas are better
hardness compared to other nitriding
processes.
- All kinds of nitriding process it is good
to change the surface hardness
of the steel and other mechanical properties
of the resultant right of
the nitriding process, depending on its
application to steel

13. Referensi
 http://en.wikipedia.org/
 http://gadgetflash.com/
 http://metals.about.com
 http://gadgetflashstore.com/
 http://gadgetflashstore.com/index.php?k=nitriding&c=all
 ASM handbook vol 4
 PT.DI

14. Thank you ….
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