For the statements below, indicate which statement(s) are true concerning phase

Question

For the statements below, indicate which statement(s) are true concerning phase equilibria within the Iron - Iron Carbide System. Ferrite is a phase. Austenite is a solid solution. It is impossible to simultaneously stabilize austenite and cementite. Pearlite is a phase FCC Iron with carbon interstitial impurities is called Ferrite. Cementite is a phase. An Fe-C alloy containing 1.15 wt% C is referred to as being hypereutectoid. Martensite is an equilibrium phase. The melting point of pure iron is 1394 Degree C Exceeding the solubility limit of C in Fe at 1200 Degree C results in the precipitation of cementite.

Explanation / Answer

1.false, ferrite is not a phase, it is BCC from of iron.

2.true, austein is solid solution of iron with an alloying element

3.false, can stabilise both

4. pearlite is two phased layered(lamellar) structure, true

5.false, ferrite is BCC form of iron.

6.true, cementite is harder phase which contains 6.67% of carbon at rom tempertaure.

7.False, it contain less than 0. 7%

8.false, martensite is not a equilibrium phase, it is a meta stable phase.

9.false, the melting point of pure iron is 1538 degrees.

10.

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