Draw Carbon-iron graph and what is roughness?

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Answering a question on Carbon-iron graph and roughness for Junior Engineer Mechanical Maintenance.

Carbon-iron graph shows the relationship between carbon content and hardness of steel.
Roughness is the measure of irregularities in a surface, usually measured in micrometers.
It can affect the performance and lifespan of mechanical components.
Surface roughness can be controlled through various machining processes such as grinding, polishing, and honing.
Carbon-iron graph can be used to determine the appropriate carbon content for a specific application.
Higher carbon content results in harder and more brittle steel, while lower carbon content results in softer and more ductile steel.

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