Iron Carbon Phase Diagram and Allotropic Transformations in Iron Quiz

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Questions and Answers

What is the crystal structure of the Fe3C (cementite) phase?

  • BCC
  • Hexagonal
  • FCC
  • Orthorhombic (correct)

What is the approximate tensile strength of Fe3C (cementite)?

  • 25,000 psi
  • 50,000 psi
  • 10,000 psi
  • 5,000 psi (correct)

What is the maximum solubility of carbon in α-ferrite at room temperature?

  • 0.76%
  • 0.55%
  • 0.10%
  • 0.25% (correct)

What is the temperature of the eutectoid reaction in the Fe-Fe3C system?

<p>727°C (D)</p> Signup and view all the answers

What is the composition of the liquid phase in the eutectic reaction in the Fe-Fe3C system?

<p>4.30% C (D)</p> Signup and view all the answers

What is the maximum carbon content of the γ-austenite phase in the Fe-Fe3C system?

<p>0.80% C (B)</p> Signup and view all the answers

What is the composition of the pearlite phase in the Fe-Fe3C system?

<p>α-Fe (0.025% C) + Fe3C (6.67% C) (B)</p> Signup and view all the answers

What is the composition of the δ-ferrite phase in the Fe-Fe3C system?

<p>0.55% C (C)</p> Signup and view all the answers

What is the composition of the liquid phase in the peritectic reaction in the Fe-Fe3C system?

<p>0.55% C (D)</p> Signup and view all the answers

What is the percentage of the ledeburite phase in the Fe-Fe3C system?

<p>17.8% (A)</p> Signup and view all the answers

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