24. The melting temperature of pure iron is: a. 1538°C b. 400°C c. 1147°C d. 727

Question

24. The melting temperature of pure iron is:
a. 1538°C b. 400°C c. 1147°C d. 727°C

25. The eutectic concentration of carbon in steel is:
a. 0.76 wt% b. 0.022 wt% c. 2.14 wt% d. 4.30 wt%

26. Pure iron has a BCC crystal structure at room temperature called Ferrite (? phase) and as you heat it the crystal structure changes to an FCC structure called Austenite (?), what is the highest temperature pure iron can have the Austenite structure?
a. 912°C b. 1394°C c. 1493°C d. 1538°C

27. A 3 wt% carbon concentration in iron is cooled from 1500°C to room temperature, what is the lowest temperature that any liquid phase can exist?
a. 1147°C b. 1280°C c. 727°C d. 1538°C

Explanation / Answer

24) a

25) a

26) b

27) a

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