GATE MT 2021 Q9. Which one of the following elements alloyed with iron is a ferrite stabilizer?
GATE MT 2021 Q9. Which one of the following elements alloyed with iron is a ferrite stabilizer?
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Answer:- Option D Ferrite stabilizers:- Ferrite stabilizers make ferrite (alpha iron BCC crystal structure) stable at a higher temperature by increasing the eutectoid temperature. These elements decrease the amount of carbon soluble in austenite and thus tend to increase the volume of free carbideRead more
Answer:- Option D
Ferrite stabilizers:- Ferrite stabilizers make ferrite (alpha iron BCC crystal structure) stable at a higher temperature by increasing the eutectoid temperature.
These elements decrease the amount of carbon soluble in austenite and thus tend to increase the volume of free carbide in the steel for a given carbide content.
Example:- Chromium, silicon, tungsten, vanadium, etc.
Refer to the attached phase diagram of Fe-Fe3C (Reference V.RAGHAVAN MATERIALS SCIENCE 6TH EDITION P.G.NO. 165)
Ferrite stabilizers increase the temperature of the gamma & (gamma+alpha) boundary (shown in attached phase diagram) thus stabilizing alpha ferrite up to higher temperatures.
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