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Iron Carbon Diagram

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γ form of iron is?

Discuss

Austenite, a solid solution of carbon and other constituents in a particular form of iron known as γ (gamma) iron. This is a face-centered cubic structure formed when the iron is heated above 910° C (1,670° F).

Austenite, a gamma form of iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron, with an alloying element.

Which of the following reaction does not exhibit mushy zone in Fe-C phase diagram?

Discuss

A eutectic reaction is a three-phase reaction, by which, on cooling, a liquid transforms into two solid phases at the same time. It is a phase reaction, but a special one.

A mushy zone is where the melting or solidification actually begins and proceeds, accompanying which the latent heat absorbs or releases.

The eutectic reaction does not exhibit mushy zone in Fe-C phase diagram.

The percentage of carbon at peritectic point in Fe-C phase diagram is?

Discuss

Peritectic point - The point on a phase diagram where a reaction takes place between a previously precipitated phase and the liquid to produce a new solid phase.

Percentage of carbon at peritectic point = 0.18%. i.e 0.18.

Peritectic reaction in the iron-carbon phase diagram takes place at a constant temperature of 1493°C.

The percentage of carbon at eutectoid point in Fe-C phase diagram is?

Discuss

A eutectic point is the lowest melting temperature for a mixture that can be obtained from the phase diagram indicating the chemical composition of any such mixture.

The percentage of carbon at the eutectic point in Fe-C phase diagram is 4.3%. This is a single-phase liquid (100%) of 4.3% carbon at the eutectic temperature of 1150°C.

The temperature (in °C) of eutectoid reaction in the iron-carbon phase diagram is?

Discuss

Eutectoid reaction:- A chemical reaction in which, during the cooling of a metal, one solid phase yields two different solid phases.

The temperature of the eutectoid reaction in the iron-carbon phase diagram is 723°C.

In the Fe-C system, there is a eutectoid point at approximately 0.8wt% C, 723°C.

The phase just above the eutectoid temperature for plain carbon steels is known as austenite or gamma.

_______ involves a single solid phase decomposing into two different solid phases.

Discuss

The Eutectoid reaction involves a single solid phase decomposing into two different solid phases: γ → α + β.

Note:- The key difference between eutectic and eutectoid reactions is that in eutectic reactions, a liquid transforms into two solid phases at the same time whereas in a eutectoid reaction, a solid transform into two other solid phases at the same time.

The temperature (in °C) of peritectic reaction in iron-carbon phase diagram is?

Discuss

A peritectic reaction is a reaction where a solid phase and liquid phase will together form a second solid phase at a particular temperature and composition.

The temperature (in °C) of peritectic reaction in iron-carbon phase diagram is 1498°C and carbon composition 0.09%.

The temperature (in °C) of eutectic reaction in iron-carbon phase diagram is?

Discuss

A eutectic reaction is a three-phase reaction, by which, on cooling, a liquid transforms into two solid phases at the same time.

The temperature of the eutectic reaction in iron-carbon phase diagram is 1147° C and carbon composition is 4.3%.

Iron-Carbon phase diagram is a ______

Discuss

⇒ The Fe - C diagram (also called the iron-carbon phase or equilibrium diagram) is a graphic representation of the respective microstructure states of the alloy iron-carbon (Fe-C) depending on temperature and carbon content.

⇒Binary phase diagrams are based on two-component systems.

⇒The two components may be mixed in an infinite number of different proportions, which indicates that composition also becomes a variable, along with pressure and temperature.

⇒The iron-carbon phase diagram, Pb-Sn diagram are the example of binary phase diagrams.

The percentage of carbon at eutectic point in Fe-C phase diagram is?

Discuss

A eutectic reaction is a three-phase reaction, by which, on cooling, a liquid transforms into two solid phases at the same time.

The percentage of carbon at the eutectic point in Fe-C phase diagram is 4.3% and the temperature of the eutectic reaction in the iron-carbon phase diagram is 1147°C

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