General Studies · Engineering Materials
According to the iron-carbon (Fe-Fe3C) binary phase diagram, when a steel of eutectoid composition (0.76% to 0.8% carbon) is cooled slowly through the eutectoid temperature (approx. 727°C), which phase transformation occurs?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Austenite decomposes into a lamellar mixture of ferrite (α) containing approximately 0.022% carbon and cementite (Fe3C) containing 6.67% carbon✓
- 2Austenite decomposes directly into a single homogeneous solution of ferrite (α) containing 6.67% carbon
- 3By cooling, simple transformation takes place without any structural or phase change
- 4Fast cooling rate gives coarse pearlite
Correct answer
Austenite decomposes into a lamellar mixture of ferrite (α) containing approximately 0.022% carbon and cementite (Fe3C) containing 6.67% carbon
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