Iron Carbon Phase Diagram

Phase diagrams metastable iron carbon fe c phase diagram. Iron carbon phase diagram with detailed explanation.

Crystal Structure Having Trouble Understanding The Iron Carbon

The alpha iron α is a body centered cubic bcc and the gamma iron γ is a face centered cubic fcc.

Iron carbon phase diagram. The different phases or mixture of phases occur in different areas enclosed by these. Iron carbon phase diagram. A study of the microstructure of all steels usually starts with the metastable iron carbon fe c binary phase diagram figure 1.

So lets start with a phase diagram that contains maximal information. Carbon content 667 corresponds to the fixed composition of the iron carbide fe 3 c. Fig 2 iron carbon phase diagram.

There is more to the iron carbon phase diagram than related in the backbone. Carbon is added to iron as an interstitial inclusion to improve the strength of iron. Steels that are 100 austenite must have temperature composition coordinates within the area of austenite shown in the phase diagram at fig 2.

In particular there is some nomenclature that i avoided in the main text but that is important for understanding other writings about iron and steel. Dmitri kopeliovich iron carbon phase diagram describes the iron carbon system of alloys containing up to 667 of carbon discloses the phases compositions and their transformations occurring with the alloys during their cooling or heating. Steels that are ferrite must have temperature composition coordinates in the narrow region at the lower left of the fe c phase diagram.

The iron carbon diagram is shown in fig. It provides an invaluable foundation on which to build knowledge of both carbon steels and alloy steels as well as a number of various heat treatments they are usually subjected to hardening annealing. The diagram shown in fig 1 actually shows two diagrams i the stable iron graphite diagram dashed lines and the metastable fe fe3c diagram.

Iron allotropes showing the differences in lattice structure. The maximum solubility of carbonc in ironfe is 667 called as critical concentration. Iron carbon eutectic phase diagram showing various forms of fe x c y substances.

In this diagram the lines indicate the boundaries where the alloy changes its phase. This figure shows the iron carbon equilibrium diagram. The ironiron carbide fefe3c phase diagram in their simplest form steels are alloys of iron fe and carbon c.

Fig 1 iron carbon phase 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. If carbon is added to iron it produces iron carbidefe 3 c phase which is hard and brittle in nature also called as cementite.

On this diagram the carbon percentage is shown on the x axis and temperature on the y axis. It is also the basis understanding of the heat treatment of steels.

Ferrite Iron