What is eutectoid composition?

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In summary, the eutectoid composition for an iron-carbon alloy is the exact composition at which the alpha phase transforms to the pearlite phase during cooling. At this composition, the alloy will undergo a eutectoid reaction, resulting in a microstructure of alternating layers of ferrite and cementite. This is illustrated in the attached diagram.
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qwerty0123
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what is eutectoid composition for an iron-carbon alloy?

what would happen to the iron-carbon alloy while cooled from the alpha phase to room temperature at this composition?
 
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Astronuc said:
See these notes:

http://www.rose-hulman.edu/~stienstr/me%20328/2003/p-review%20e3%202003(phase).htm [Broken]

http://www.sv.vt.edu/classes/MSE2094_NoteBook/96ClassProj/examples/kimcon.html [Broken]

http://www-g.eng.cam.ac.uk/mmg/teaching/typd/addenda/microstructures1.html

I'm using this diagram: see attachment
 

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1. What is the definition of eutectoid composition?

Eutectoid composition refers to the specific ratio of two or more elements in an alloy or mixture that forms a eutectoid reaction, resulting in a specific microstructure and properties.

2. How is eutectoid composition determined?

Eutectoid composition is determined through experimentation and analysis of the phase diagram for the specific alloy or mixture. The eutectoid composition is typically the point at which the liquid phase transforms into two solid phases upon cooling.

3. What is the significance of eutectoid composition in materials science?

Eutectoid composition is significant because it determines the microstructure and properties of an alloy or mixture. This allows for precise control over the material's characteristics, such as strength, hardness, and corrosion resistance.

4. How does eutectoid composition differ from eutectic composition?

Eutectoid composition and eutectic composition are similar in that they both refer to specific ratios of elements in a mixture. However, eutectoid composition involves a eutectoid reaction, while eutectic composition involves a eutectic reaction.

5. Can eutectoid composition vary in a single material?

Yes, eutectoid composition can vary in a single material, as it depends on the specific elements and their ratios. Different compositions can result in different microstructures and properties, allowing for a wide range of materials with varying characteristics.

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