What is the maximum solubility limit percentage of carbon dissolved in ferrite___________________?
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Answer: A. 0.025%
Explanation
The maximum solid solubility limit of carbon in alpha-ferrite at the eutectoid temperature is very low, approximately 0.025%. Because body-centered cubic ferrite has restricted interstitial spaces, it can accommodate only minimal amounts of dissolved carbon atoms. Cooling below the eutectoid temperature forces excess carbon out of solution to form discrete iron carbide cementite precipitates. Alpha-ferrite is a soft and ductile solid solution of carbon dissolved in body-centered cubic iron stable at room temperature. Phase diagrams map out the maximum compositional limits of solid solutions across varying metallurgical temperatures and pressures. Carbon atoms occupy interstitial positions within the iron crystal lattice, distorting the atomic structure and increasing hardness.
Option B, C, and D overestimate the solid solubility limit of carbon in alpha-ferrite, which cannot exceed fraction of a percent. Option E (0.8%) represents the eutectoid carbon composition of steel where austenite transforms entirely into pearlite, not ferrite solubility. id_placeholder_fix
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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