The Iron–Carbon (Fe–C) phase diagram is the foundation of metallurgy and steel engineering. In this short video, you’ll learn how carbon percentage and temperature control the phases of iron—ferrite, austenite, cementite, and pearlite. We also explain the difference between steel and cast iron, and why the eutectoid point at 0.76% carbon and 727°C is so important for heat treatment. Perfect for mechanical engineering students, welders, and anyone learning materials science. #MechanicalEngineerin