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CARBONITRIDING
(material science and metallurgy engineering(2131904))
 NAME: JAIMIN AJITKUMAR KEMKAR
 NUMBER: 11
 CLASS: 3D
 BATCH: D1
 GUIDED BY: SUBHAM M. SARTHI
OUTLINE OF PRASENTATION
1. INTRODUCTION
2. PROCESS
3. OBJECTIVES OF CARBONITRIDING
4. ADVANTAGES
5. DISADVANTAGES
6. APPLICATION
INTRODUCTION
What is carburizing process?
 It is a heat treatment process that produces a surface which is resistant to wear, while
maintaining toughness and strength of the core.
What is Carbonitriding?
 A diffusion-hardening process for ferrous metals in which both carbon and nitrogen
are introduced into the work piece surface by heating the work piece while in contact
with a gas or liquid containing carbon and nitrogen.
 A modification of Carburizing (but is done at a lower temperature around 850°C / 1550
°F and for shorter time)
 Also known as: Dry Cyaniding, Gas Cyaniding and Nicarbing CARBONITRIDING
 It produces a shallower case (0.075 to 0.75mm) than carburizing.
PROCESS
COMPOSITION:
5 - 12 % Ammonia is added to the carburizing atmosphere, which provides a source of
nitrogen.
Gas Composition – Methane + Ammonia
Ammonia decomposes at the surface as
 2𝑁𝐻3 = 𝑁2 + 3𝐻2
PROCESS VARIABLES:
 Temperature - 850 – 1550° F
 Duration
This molecular Nitrogen can not be Absorbed to the steel surface.
0.5 to 0.8% carbon and 0.2-0.4% Nitrogen is added to the Steel surface.
The carbon provides the base metal with a high carbon surface, and the nitrogen
provides the case with an added boost of hardenability to insure full case
hardness.
• Quenching is done after Heating to get hard martensitic structure.
• Sometimes Tempering is done to ensure ductility by eliminating internal micro
stresses and by somewhat reducing the hardness.
Carbonitriding cycle including cooling(quenching) and
Tempering Step.
Objectives Of Carbonitriding
To obtain higher surface hardness
To increase wear resistance & Fatigue Strength
To obtain higher corrosion resistance
To have good high temperature properties
ADVANTAGES
• It gives high surface hardness
• Nitriding increases wear resistance
• It increase the tensile strength and yield point
• Improves fatigue life by 30% to 100%
• It is good for high temperature applications.
• It is carried out at a lower temperature and for a shorter time than is gas
carburizing
• Reduced distortion due to lower temperature.
DISADVANTAGE
• Asymmetric products could bucked due to unequal cooling effects
• Maximum dimensions are determined by the furnace dimension
• Blind holes cannot be treated during plasma – nitriding
• Toughness and impact resistance decrease.
• It produce shallower case
• It is not possible to obtain higher core hardness and deeper case depth.
• Only useful for plain carbon steel or low alloy steel.
• Ammonia can produce harmful effects.
REFERANCIES
BOOKS
 material science and metallurgy (O. P. Khanna)
 material science (R. S. Khurmi)
WEB
 Wikipedia
 http://www.citysteelht.com
 http://www.metlabheattreat.com
 http://www.ecm-furnaces.com
 Google E-Books
Carbonitriding

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Carbonitriding

  • 1. CARBONITRIDING (material science and metallurgy engineering(2131904))  NAME: JAIMIN AJITKUMAR KEMKAR  NUMBER: 11  CLASS: 3D  BATCH: D1  GUIDED BY: SUBHAM M. SARTHI
  • 2. OUTLINE OF PRASENTATION 1. INTRODUCTION 2. PROCESS 3. OBJECTIVES OF CARBONITRIDING 4. ADVANTAGES 5. DISADVANTAGES 6. APPLICATION
  • 3. INTRODUCTION What is carburizing process?  It is a heat treatment process that produces a surface which is resistant to wear, while maintaining toughness and strength of the core. What is Carbonitriding?  A diffusion-hardening process for ferrous metals in which both carbon and nitrogen are introduced into the work piece surface by heating the work piece while in contact with a gas or liquid containing carbon and nitrogen.  A modification of Carburizing (but is done at a lower temperature around 850°C / 1550 °F and for shorter time)  Also known as: Dry Cyaniding, Gas Cyaniding and Nicarbing CARBONITRIDING  It produces a shallower case (0.075 to 0.75mm) than carburizing.
  • 4. PROCESS COMPOSITION: 5 - 12 % Ammonia is added to the carburizing atmosphere, which provides a source of nitrogen. Gas Composition – Methane + Ammonia Ammonia decomposes at the surface as  2𝑁𝐻3 = 𝑁2 + 3𝐻2 PROCESS VARIABLES:  Temperature - 850 – 1550° F  Duration This molecular Nitrogen can not be Absorbed to the steel surface.
  • 5. 0.5 to 0.8% carbon and 0.2-0.4% Nitrogen is added to the Steel surface. The carbon provides the base metal with a high carbon surface, and the nitrogen provides the case with an added boost of hardenability to insure full case hardness.
  • 6. • Quenching is done after Heating to get hard martensitic structure. • Sometimes Tempering is done to ensure ductility by eliminating internal micro stresses and by somewhat reducing the hardness. Carbonitriding cycle including cooling(quenching) and Tempering Step.
  • 7. Objectives Of Carbonitriding To obtain higher surface hardness To increase wear resistance & Fatigue Strength To obtain higher corrosion resistance To have good high temperature properties
  • 8. ADVANTAGES • It gives high surface hardness • Nitriding increases wear resistance • It increase the tensile strength and yield point • Improves fatigue life by 30% to 100% • It is good for high temperature applications. • It is carried out at a lower temperature and for a shorter time than is gas carburizing • Reduced distortion due to lower temperature.
  • 9. DISADVANTAGE • Asymmetric products could bucked due to unequal cooling effects • Maximum dimensions are determined by the furnace dimension • Blind holes cannot be treated during plasma – nitriding • Toughness and impact resistance decrease. • It produce shallower case • It is not possible to obtain higher core hardness and deeper case depth. • Only useful for plain carbon steel or low alloy steel. • Ammonia can produce harmful effects.
  • 10. REFERANCIES BOOKS  material science and metallurgy (O. P. Khanna)  material science (R. S. Khurmi) WEB  Wikipedia  http://www.citysteelht.com  http://www.metlabheattreat.com  http://www.ecm-furnaces.com  Google E-Books