Millwright Level 1 Practice Exam

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What is the primary characteristic of cementite?

It is mainly composed of iron and carbon
It is a type of hardened steel
It has a low carbon content
It can only be formed through cooling

The correct answer is: It is mainly composed of iron and carbon

The primary characteristic of cementite is that it is mainly composed of iron and carbon. Cementite, also known as iron carbide, has a chemical formula of Fe3C, indicating that it consists of three iron atoms and one carbon atom. This compound plays a crucial role in the microstructure of steel and cast iron, affecting their properties significantly. The presence of cementite in the steel matrix contributes to its hardness and strength, which are critical for various applications in mechanical and structural engineering. Other options do not capture the essential nature of cementite. While it does exhibit hardness, identifying it purely as a type of hardened steel does not encompass its composition. Cementite has a relatively high carbon content, contrary to the notion of low carbon content. Lastly,while cooling processes influence its formation, cementite can also be present in other microstructural transformations under different thermal and mechanical conditions. Therefore, the emphasis on its iron and carbon composition accurately reflects cementite's nature.