What is Fe-Fe3C 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. ➢ 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 are solid phases in the Fe-Fe3C phase diagram?
Solid phases in the Fe-Fe3C phase diagram: Four solid phases, namely α-Ferrite, Austenite, Cementite (Fe3C), and δ-Ferrite.
Which is the hardest phase that appears in Fe-Fe3C phase diagram?
Ledeburite is the eutectic mixture of austenite and cementite. Cementiteor iron carbide is very hard, brittle intermetallic compound of iron & carbon, as Fe3C, contains 6.67 % C. It is the hardest structure that appears on the diagram, exact melting point unknown.
What are the important phases present in iron iron carbide diagram?
Five phases are- α-ferrite (BCC) Fe-C solid solution, γ-austenite (FCC) Fe-C solid solution, δ -ferrite (BCC) Fe-C solid solution, Fe3C (iron carbide) or cementite – an inter- metallic compound and liquid Fe-C solution.
What is the effect of alloying elements on Fe Fe3C diagram?
The effect of alloying elements on the Fe-Fe3C phase diagram is strongly reflected in the eutectoid temperature, which is raised or lowered by the alloying addition. The austenite stabilizers lower the eutectoid temperature, thereby widening the temperature range over which austenite is stable.
What are the important phases present in iron-iron carbide diagram?
What is the use of iron carbon diagram?
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. Also, both alloys contain a small amount of trace elements.
What is the eutectoid composition for the FE Fe3C system?
The eutectoid reaction describes the phase transformation of one solid into two different solids. In the Fe-C system, there is a eutectoid point at approximately 0.8wt% C, 723°C.
What is the importance of TTT diagram?
Definition: TTT diagrams give the kinetics of isothermal transformations.
What are the significant effects of alloying element in iron?
Alloying elements increase the strength of cast irons through their effect on the matrix. Common alloy elements include manganese, copper, nickel, molybdenum, and chromium, elements added primarily to control the matrix microstructure, having only a small effect upon the solidification microstructure.