Which alloy is primarily composed of iron and carbon?

Study for the Chemistry for Engineers Test. Enhance your knowledge with multiple choice questions and in-depth explanations. Prepare confidently for your exam!

Multiple Choice

Which alloy is primarily composed of iron and carbon?

Explanation:
The main idea is that steel is an iron-carbon alloy. Pure iron is relatively soft, so adding carbon strengthens it by impeding the movement of dislocations in the crystal lattice. The carbon content in steel is what sets its properties: roughly 0.2% to 2% carbon, with lower amounts giving more ductility and higher amounts yielding greater hardness and strength. Cast iron has a higher carbon content (about 2.5% to 4%) and often graphite, which makes it hard but brittle. Bronze and brass are copper-based alloys (tin for bronze, zinc for brass) and do not rely on iron or carbon as their main strengthening element.

The main idea is that steel is an iron-carbon alloy. Pure iron is relatively soft, so adding carbon strengthens it by impeding the movement of dislocations in the crystal lattice. The carbon content in steel is what sets its properties: roughly 0.2% to 2% carbon, with lower amounts giving more ductility and higher amounts yielding greater hardness and strength. Cast iron has a higher carbon content (about 2.5% to 4%) and often graphite, which makes it hard but brittle. Bronze and brass are copper-based alloys (tin for bronze, zinc for brass) and do not rely on iron or carbon as their main strengthening element.

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