What is phase in iron carbon diagram?

What is phase in iron carbon diagram?

For the iron-carbon phase diagram, the phase fields of interest are the ferrite, cementite, austenite, ferrite + cementite, ferrite + austenite, and austenite + cementite phase fields.

What are the solubilities in wt% C of carbon in the α δ and γ forms of iron?

In α-iron the solubility is only 0.04% (ferrite) and in δ-iron the solubility is 0.36%. In the λ-modification with its fcc structure, carbon and iron form an intercalation lattice as a solid solution called austenite with the maximum solubility of 2.06% carbon at 1147 °C. Iron with more carbon is called cast iron.

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).

How many phases does an iron-carbon diagram have?

The boundaries, intersecting each other, mark certain regions on the Fe3C diagram. Within each region, a different phase or two phases may exist together. At the boundary, the phase change occurs.

Is iron-carbon phase diagram is a binary phase diagram?

Explanation: Melting point of iron in degree centigrade is 1535oC. Explanation: Binary phase diagrams are based on two component systems. Here, 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.

What is the crystal structure of α Fe and ɣ Fe respectively?

The alpha iron (α-Fe) is a body-centered cubic (BCC) and the gamma iron (γ-Fe) is a face-centered cubic (FCC).

Is martensite FCC or BCC?

The two-step theory. The two most usual martensitic transformations are fcc–hcp in Co, FeMn and some FeCrNi alloys, and bcc–hcp in Zr and Ti alloys [22], [23], [25].

What is Alpha in iron-carbon diagram?

Iron-carbon eutectic phase diagram, showing various forms of FexCy substances. Iron allotropes, showing the differences in structure. The alpha iron (α-Fe) is a body-centered cubic (BCC) and the gamma iron (γ-Fe) is a face-centered cubic (FCC).

How many phases does an iron carbon diagram have?

Why is the Fe Fe3C phase diagram a metastable phase diagram instead of a true equilibrium phase diagram?

Fe-Fe3C phase diagram is not a true equilibrium phase diagram because of un- stability of iron carbide (Fe3C) compound. Under certain conditions Fe3C will decompose into more stable phases of iron and graphite.