Table of Contents
- 1 What does the iron carbon phase diagram represent?
- 2 What are the three important reactions that occur in iron carbon phase diagram?
- 3 What are phases of steel?
- 4 Who invented iron-carbon diagram?
- 5 What is the critical temperature on the iron-carbon diagram?
- 6 How is the phase of iron carbon calculated?
- 7 What are the mechanical properties of iron carbon?
- 8 Which is an interstitial impurity in the iron carbon system?
What does the iron carbon phase diagram represent?
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 are the three important reactions that occur in iron carbon phase diagram?
The invariant eutectoid reaction in Fe-Fe3C diagram is given by equation: i.e. during cooling, austenite of 0.77%C at constant eutectoid temperature, 727°C undergoes eutectoid transformation to form a mixture of ferrite (e = 0.02%) and cementite i.e. there are alternate lamellae of ferrite and cementite.
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 …
What are phases of steel?
There are only three phases involved in any steel—ferrite, carbide (cementite), and aus- tenite, whereas there are several structures or mixtures of structures.
Who invented iron-carbon diagram?
In 1868 D.K. Chernov made the greatest discovery, beginning a new period in the history of investiga- tions of the Fe-C system. It was 100 years ago that Chernov published his “Critical review of papers by Lavrov and Kalakutskii on steel and steel cannons and D.K.
What is Curie temperature in iron-carbon diagram?
The A2 temperature is the Curie point when iron changes from the ferro to the paramagnetic condition. This temperature is 769 Deg. C for pure iron, but no change in crystal structure is involved.
What is the critical temperature on the iron-carbon diagram?
Addition of carbon in amounts more than 0.02% in iron, results in this critical point due to the eutectoid invariant transformation at constant temperature of 727°C, where pearlite changes to austenite (of 0.77 % C) on heating and vice versa.
How is the phase of iron carbon calculated?
The graph is quite complex but since we are limiting our exploration to Fe3C, we will only be focusing up to 6.67 weight percent of 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.
Which is the correct description of the iron-carbon diagram?
The iron-carbon diagram (also called the iron-carbon phase or equilibrium diagram) is a graphic representation of the respective microstructure states depending on temperature (y axis) and carbon content (x axis). The actual iron-carbon diagram is far larger than the part shown here.
What are the mechanical properties of iron carbon?
Mechanical properties of iron-carbon alloys (iron and steels) depend on their microstructure, that is, how the different phases are mixed. The iron –carbon phase diagram in Fig 2 actually shows two diagrams namely (i) the stable iron-graphite diagram (red lines), (ii) and the metastable Fe-Fe3C diagram.
Which is an interstitial impurity in the iron carbon system?
There are some important metallurgical phases and micro constituents in the iron carbon system. In the Fe–Fe3C system, carbon is an interstitial impurity in Fe. It forms a solid solution with alpha (alpha ferrite), gamma (austenite), and delta (delta ferrite) phases of iron. These are important phases in Fe – Fe3C phase diagram.