What is ferrite very low solubility of carbon, while austenite has solubility of carbon?
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It is a solid solution of carbon and iron. The carbon percentage is only upto 0.02% I.e, solubility of carbon in @- iron is 0.02%. It is pure iron at room temperature. It has become structure. The interatomic spaces are small, thus spherical carbon atoms cannot be accommodated in iron atoms. That is why the solubility of carbon is less. The maximum solubility is 0.0218% at 723' C and at room temperature the solubility is only 0.008%.
The carbon atom is small for substitution and too large for interstitial solid solution. Ferrite is soft and ductile. It is magnetic under 770'c.
Austenite: The maximum solubility of carbon in @ iron is 2.11%. It has fcc structure. It has larger interatomic spacings than ferrite. carbon atoms are accommodated at interstitial spaces. Austenite is soft,rough and highly ductile. It has low tensile strength. It is much suited for fabrication processes. Most of the rolling and forging operation are done at or above 1150'c. It is non magnetic at any temperature.
The carbon atom is small for substitution and too large for interstitial solid solution. Ferrite is soft and ductile. It is magnetic under 770'c.
Austenite: The maximum solubility of carbon in @ iron is 2.11%. It has fcc structure. It has larger interatomic spacings than ferrite. carbon atoms are accommodated at interstitial spaces. Austenite is soft,rough and highly ductile. It has low tensile strength. It is much suited for fabrication processes. Most of the rolling and forging operation are done at or above 1150'c. It is non magnetic at any temperature.
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