What is the iron carbon 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 indicate by ion carbon diagram?
Dmitri Kopeliovich. Iron-carbon phase diagram describes the iron-carbon system of alloys containing up to 6.67% of carbon, discloses the phases compositions and their transformations occurring with the alloys during their cooling or heating.
Why iron carbon diagram is called equilibrium diagram?
The iron carbide is called meta stable phase. Therefore, iron-iron carbide diagram even though technically represents meta stable conditions, can be considered as representing equilibrium changes, under conditions of relatively slow heating and cooling.
What are the limitations of a iron carbon phase diagram?
10.9 Two limitations of the iron-iron carbide phase diagram are: 1) The nonequilibrium martensite phase does not appear on the diagram; and 2) The diagram provides no indication as to the time-temperature relationships for the formation of pearlite, bainite, and spheroidite, all of which are composed of the equilibrium …
Is ferrite FCC or BCC?
Ferrite is a common constituent in steels and has a Body Centred Cubic (BCC) structure [which is less densely packed than FCC].
What are the three important reactions that occur in iron carbon phase diagram?
Three-phase reactions that occur in Fe-Fe3C phase diagram are: 1- Eutectic – at (1147 ºC ) and (4.3 wt% C), [ L ↔ Ledeburite (γ + Fe3C)]. 2- Eutectoid – at (723 ºC) and (0.83 wt% C), [ γ ↔ Pearlite (α + Fe3C)]. 3- Peritectic – at (1493 ºC) and (0.16 wt% C), [ L + δ ↔ γ ].
What is ACM line in iron carbon diagram?
The line on the diagram named ‘Acm’ defines the solubility limit for C in austenite. It can be seen that at 820 deg C, this line gives a point at 1 % C, which is the maximum amount of C that can be dissolved in austenite at 820 deg C.
Why is cementite metastable?
Cementite often is said to be metastable with respect to graphite. However, as shown in Figure 2, pure cementite when allowed to coexist only with graphite, is stable in the presence of graphite, pre- sumably because the iron does not dissolve in graph- ite.
What are the three important reactions that occur in iron-carbon phase diagram?
What is iron-carbon diagram?
The Iron-Carbon Diagram: A map of the temperature at which different phase changes occur on very slow heating and cooling in relation to Carbon, is called Iron- Carbon Diagram. Iron- Carbon diagram shows –
What is the phase diagram of iron carbon?
This iron carbon phase diagram is plotted with the carbon concentrations by weight on the X-axis and the temperature scale on the Y-axis. The carbon in iron is an interstitial impurity.
What is the structure of carbon in iron?
The carbon in iron is an interstitial impurity. The alloy may form a face centred cubic (FCC) lattice or a body centred cubic (BCC) lattice. It will form a solid solution with α, γ, and δ phases of iron.
What type of lattice is formed from carbon in iron?
The carbon in iron is an interstitial impurity. The alloy may form a face centred cubic (FCC) lattice or a body centred cubic (BCC) lattice. It will form a solid solution with α, γ, and δ phases of iron. Types of Ferrous Alloys on the Phase Diagram