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During carburising, carbon is introduced to form a layer of high carbon at the surface, The carbon is introduced in the form of
- a)free carbon
- b)graphite flakes
- c)pearlite
- d)cementite
Correct answer is option 'B'. Can you explain this answer?
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During carburising, carbon is introduced to form a layer of high carbo...
Carburizing is the most widely method of surface hardening. The surface layers of a low carbon steel (C ≤ 0.2%) is enriched with carbon up to 0.8 - 1 %. The source of carbon may be a solid , liquid or gas medium. In all cases, the carbon enters the steel at the surface-and diffuse into the steel as a function of time at an elevated temperature.
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During carburising, carbon is introduced to form a layer of high carbo...
Carburising is a heat treatment process in which carbon is introduced to the surface of a low carbon steel component to increase its surface hardness. The carbon is introduced in the form of graphite flakes. This is because graphite flakes have a high surface area to volume ratio, which makes it easier for carbon to diffuse into the steel.
The carburising process involves heating the steel component in a carbon-rich atmosphere at a temperature between 850°C to 950°C for a period of several hours. During this time, carbon from the graphite flakes diffuses into the steel, forming a layer of high carbon at the surface. The depth of the carburised layer depends on the duration of the carburising process and the carbon potential of the atmosphere.
The carburised layer is typically between 0.1mm to 2mm thick, depending on the application. The high carbon layer at the surface of the steel component is then hardened by quenching in oil or water. This results in a hard, wear-resistant surface layer, while the core of the component remains tough and ductile.
The benefits of carburising include improved wear resistance, improved fatigue strength, and improved resistance to corrosion. It is commonly used in the manufacture of gears, bearings, and other components that require high surface hardness.
In conclusion, during carburising, carbon is introduced in the form of graphite flakes to form a layer of high carbon at the surface of the steel component. This layer is then hardened by quenching, resulting in improved wear resistance and other mechanical properties.
The carburising process involves heating the steel component in a carbon-rich atmosphere at a temperature between 850°C to 950°C for a period of several hours. During this time, carbon from the graphite flakes diffuses into the steel, forming a layer of high carbon at the surface. The depth of the carburised layer depends on the duration of the carburising process and the carbon potential of the atmosphere.
The carburised layer is typically between 0.1mm to 2mm thick, depending on the application. The high carbon layer at the surface of the steel component is then hardened by quenching in oil or water. This results in a hard, wear-resistant surface layer, while the core of the component remains tough and ductile.
The benefits of carburising include improved wear resistance, improved fatigue strength, and improved resistance to corrosion. It is commonly used in the manufacture of gears, bearings, and other components that require high surface hardness.
In conclusion, during carburising, carbon is introduced in the form of graphite flakes to form a layer of high carbon at the surface of the steel component. This layer is then hardened by quenching, resulting in improved wear resistance and other mechanical properties.
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During carburising, carbon is introduced to form a layer of high carbon at the surface, The carbon is introduced in the form ofa)free carbonb)graphite flakesc)pearlited)cementiteCorrect answer is option 'B'. Can you explain this answer?
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