What is iron carbon phase diagram?

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. To explain this diagram, an introduction about metal structures and pure iron must be done.

What is iron carbon equilibrium diagram?

The part of iron-carbon alloy system diagram between pure iron and an interstitial compound, iron carbide (Fe3C), containing 6.67 percent carbon by weight is called iron-iron carbide equilibrium diagram. In fact, the compound iron carbide decomposes into iron and carbon (graphite).

Which phase is not present in iron carbon phase diagram?

The phase diagram has all three phases ferrite, pearlite, cementite but not martensite.

What is Fe fe3c diagram?

The Fe-C phase diagram is a fairly complex one, but we will only consider the steel part of the diagram, up to around 7% carbon. ➢ α-ferrite – solid solution of C in BCC Fe • Stable form of iron at room temperature. The maximum solubility of C is 0.022 wt%. Transforms to FCC γ-austenite at 912 °C.

What is the hardest phase of Fe-C system?

Explanation: Martensite is the hardest phase that can be produced by quenching a steel. Its BHN is about 700. The high rate of strain hardening and dispersion strengthening mechanisms makes the martensite hardest among steel phases.

Is steel a FCC or BCC?

The phase diagrams for steels are on p24 of your book. Ferrite is a common constituent in steels and has a Body Centred Cubic (BCC) structure [which is less densely packed than FCC].

What is Curie temperature on iron carbon equilibrium diagram?

The A2 temperature is the Curie point when iron changes from the ferro to the paramagnetic condition. This temperature is 769 Deg.

Why do we need an iron carbon phase diagram?

The service life also improves as phase diagrams show us how to solve problems such as intergranular corrosion, hot corrosion, and hydrogen damage. The iron-carbon phase diagram is widely used to understand the different phases of steel and cast iron. Both steel and cast iron are a mix of iron and carbon.

What is the phase diagram for austenite and Fe?

The Fe- C phase diagram is shown in Fig 2. In pure iron, austenite transforms to ferrite on cooling to 912 deg C. This transition temperature is traditionally called the A3 temperature, and the diagram shows that adding C to Fe lowers the A3 temperature.

How is the Fe-C phase diagram used in heat treatment?

Fe-C phase diagram is also used as the basis for the understanding of the heat treatment processes. Many of the basic features of Fe-C system influence the behaviour of even the most complex alloy iron and steels.

How does Fe-C affect the behaviour of iron and steel?

Many of the basic features of Fe-C system influence the behaviour of even the most complex alloy iron and steels. For example, the phases found in the simple binary Fe-C system persist in complex steels, but it is necessary to examine the effects alloying elements have on the formation and properties of these phases.