Phase Transformations in Iron-Carbon Systems MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Phase Transformations in Iron-Carbon Systems”.

1. What is the Eutectic reaction at 1146°C?
a) L (0.53% C) + δ(0.09% C) → γ(0.17% C)
b) L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C)
c) γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C)
d) L (0.53% C) + δ(0.09% C) → γ (0.8 % C)

2. What is Eutectoid reaction at 727°C?
a) L (0.53% C) + δ(0.09% C) → γ(0.17% C)
b) L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C)
c) γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C)
d) L (0.53% C) + δ(0.09% C) → γ (0.8 % C)

3. What is the Peritectic reaction at 1495°C?
a) L (0.53% C) + δ(0.09% C) → γ(0.17% C)
b) L (4.3% C) → γ(2.1 % C) + Fe3C (6.67% C)
c) γ (0.8 % C) → α (0.025% C) + Fe3C (6.67% C)
d) L (0.53% C) + δ(0.09% C) → γ (0.8 % C)

4. The eutectic mixture of austenite (γ) and cementite (Fe3C) is called __________
a) Ledeburite
b) Pearlite
c) Hyper and hypo eutectoid steel
d) Cast iron

5. Compositions right and left of 0.8% C of Pearlite are called __________
a) Ledeburite
b) Ferrite
c) Hyper and Hypoeutectoid steel
d) Cast iron

6. From the following figure if Diffusion rates below Ms is so low that γ → M transformation is a diffusionless process then what is change in crystal structure

materials-science-questions-answers-online-quiz-q8

a) FCC → BCT
b) FCC → BCC
c) BCC → BCT
d) BCT → BCC

7. The eutectoid mixture of ferrite (α) and cementite (Fe3C) is called __________
a) Ledeburite
b) Pearlite
c) Hyper and hypo eutectoid steel
d) Cast iron

8.Compositions above 2.1% C is called as _______
a) Ledeburite
b) Ferrite
c) Hyper and Hypoeutectoid steel
d) Cast iron

9. Finer size pearlite is called _______
a) Troostite
b) Ledeburite
c) Ferrite
d) Sorbite

10. A eutectoid steel is slowly cooled from a temperature of 750°C to a temperature just below 727°C. Calculate the percentage of ferrite and cementite.
a) 88.3% and 11.7%
b) 70% and 30 %
c) 85.4% and 14.6%
d) 20% and 20%

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