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In case carburising Carbon is introduced to form a high carbon layer at thesurface. The carbon is introduce in the form of
- a)Graphite flakes
- b)Pearlite
- c)Cementite
- d)Free carbon
Correct answer is option 'D'. Can you explain this answer?
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In case carburising Carbon is introduced to form a high carbon layer a...
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In case carburising Carbon is introduced to form a high carbon layer a...
Carburising is a heat treatment process used to increase the surface hardness of low carbon steels. During this process, carbon is introduced to the surface of the steel to form a high carbon layer. The carbon is introduced in the form of free carbon.
Explanation:
Carburising is a diffusion process in which carbon is diffused into the surface of a low carbon steel to increase its hardness. The process is carried out at high temperatures (usually between 850°C to 950°C) in a carbon-rich atmosphere. The carbon-rich atmosphere can be created by using solid, liquid, or gaseous carbon sources.
During carburising, carbon diffuses into the steel surface in the form of free carbon atoms. These free carbon atoms react with the iron atoms in the steel to form iron carbide (Fe3C), which is also known as cementite. The cementite layer formed at the surface of the steel is hard and wear-resistant.
The carbon can also react with the iron in the steel to form other carbon-rich phases such as pearlite, ferrite, and graphite. However, these phases do not contribute to the surface hardness of the steel.
Therefore, the correct answer is option 'D', which states that carbon is introduced in the form of free carbon.
Explanation:
Carburising is a diffusion process in which carbon is diffused into the surface of a low carbon steel to increase its hardness. The process is carried out at high temperatures (usually between 850°C to 950°C) in a carbon-rich atmosphere. The carbon-rich atmosphere can be created by using solid, liquid, or gaseous carbon sources.
During carburising, carbon diffuses into the steel surface in the form of free carbon atoms. These free carbon atoms react with the iron atoms in the steel to form iron carbide (Fe3C), which is also known as cementite. The cementite layer formed at the surface of the steel is hard and wear-resistant.
The carbon can also react with the iron in the steel to form other carbon-rich phases such as pearlite, ferrite, and graphite. However, these phases do not contribute to the surface hardness of the steel.
Therefore, the correct answer is option 'D', which states that carbon is introduced in the form of free carbon.
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In case carburising Carbon is introduced to form a high carbon layer at thesurface. The carbon is introduce in the form ofa)Graphite flakesb)Pearlitec)Cementited)Free carbonCorrect answer is option 'D'. Can you explain this answer?
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