What is the maximum carbon solubility percentage within the austenite crystal structure______________?
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Answer: E. 1.7%.
Explanation
The maximum solid solubility of carbon in austenite is approximately 1.7% at the eutectic temperature. Austenite possesses a face-centered cubic crystal structure with larger interstitial spaces that accommodate more carbon than ferrite. Exceeding this 1.7% carbon solubility limit at high temperatures results in the formation of surplus iron carbide or ledeburite. Austenite, also known as gamma-iron, is a metallic solid solution of carbon in face-centered cubic iron stable at elevated temperatures. Iron-carbon phase diagrams provide metallurgists with exact solubility boundaries essential for hardening and heat-treating steel alloys. Upon cooling, austenite transforms into various microstructures such as pearlite, bainite, or martensite depending on cooling rates.
Option A (0.025%) represents the maximum carbon solubility in low-temperature alpha-ferrite rather than high-temperature austenite. Options B, C, and D underestimate the maximum carbon solubility limit attainable within the face-centered cubic austenite crystal lattice. id_placeholder_fix_2
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- Engineering
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- Mechanical Engineering
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- medium
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