Question:
The effect of ferrite stabilizers on Fe–Fe$_3$C phase diagram is:
The effect of ferrite stabilizers on Fe–Fe$_3$C phase diagram is:
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Ferrite stabilizers shrink the austenite field and promote ferrite formation.
Updated On: Jun 29, 2026
- Lowers A1 point and raises A4 point
- Increases the austenite region
- Decreases the amount of carbon in gamma iron
- Raises the eutectoid temperature
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The Correct Option is C
Solution and Explanation
Concept:
Ferrite stabilizers are alloying elements such as:
\[
Cr,\ Si,\ Mo,\ W
\]
Their primary effect is to stabilize the $\alpha$ (ferrite) phase and reduce the stability of $\gamma$ (austenite) phase.
In the Fe–Fe$_3$C phase diagram, carbon solubility in austenite is a key factor controlling phase boundaries.
Step 1: Effect on phase stability.
Ferrite stabilizers:
• Expand ferrite region
• Shrink austenite region This happens because they increase the stability of BCC iron relative to FCC iron.
Step 2: Effect on carbon solubility.
Austenite (FCC) normally dissolves carbon up to about 2.11% at eutectic temperature. Ferrite stabilizers:
• reduce solubility of carbon in $\gamma$ iron
• push carbon out of austenite Thus: \[ \text{Carbon content in }\gamma \text{ iron decreases} \] Final Answer: \[ \boxed{\text{Decreases the amount of carbon in gamma iron}} \]
Step 1: Effect on phase stability.
Ferrite stabilizers:
• Expand ferrite region
• Shrink austenite region This happens because they increase the stability of BCC iron relative to FCC iron.
Step 2: Effect on carbon solubility.
Austenite (FCC) normally dissolves carbon up to about 2.11% at eutectic temperature. Ferrite stabilizers:
• reduce solubility of carbon in $\gamma$ iron
• push carbon out of austenite Thus: \[ \text{Carbon content in }\gamma \text{ iron decreases} \] Final Answer: \[ \boxed{\text{Decreases the amount of carbon in gamma iron}} \]
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