ENT147/3 Engineering Materials QUIZ 3

30 November 2016 : 1 hour

1. Write equations for: eutectic, eutectoid, peritectic and peritectoid. How many DOF exists at these invariant reaction points in binary phase diagram? Use P + F = C + 2.

2. Determine the amount of each phase in the Cu-40% Ni alloy at 1300°C, 1270°C, 1250°C and 1200°C.

(9 Marks)

ENT147/3 Engineering Materials QUIZ 3

29 November 2016 : 1 hour

3. Complete the following Fe-FeC (Iron - iron carbide) phase diagram.

E

B

I

F

D

G

C

(3 Marks)

A H

ANSWERS

ANSWERS

(3 Marks)

A: -ferrite D: 6.70 G: + L

B: + Fe3C E: -austenite H: 4.30

C: Cementite (Fe3C) F: + Fe3C I: 727C