Mechanical Engineering Exam > Mechanical Engineering Questions > Increasing carbon content in steel, _________...
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Increasing carbon content in steel, _________ ultimate strength and ____ ductility of steel.
- a)increases, decreases
- b)decreases, decreases
- c)increases, increases
- d)decreases, increases
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Increasing carbon content in steel, _________ ultimate strength and __...
Explanation:
Carbon steel is an alloy of iron and carbon.
As the carbon content increases:
Carbon steel is an alloy of iron and carbon.
As the carbon content increases:
- The ultimate strength of steel increases.
- The elongation before fracture decreases.
- The ductility of the metal decreases.
- Increasing carbon also reduces the weldability, especially above 0.25% carbon.
- Plasticity and ductility are similar.
- Generally, carbon is the most important commercial steel alloy. Increasing carbon content increases hardness and strength and improves hardenability.
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Community Answer
Increasing carbon content in steel, _________ ultimate strength and __...
Increasing carbon content in steel affects its mechanical properties in different ways:
- Ultimate Strength:
- Increasing carbon content in steel typically leads to an increase in ultimate strength. This is because carbon atoms occupy interstitial positions in the iron crystal lattice, leading to distortion and strengthening of the lattice structure. This results in higher strength and hardness of the steel.
- Ductility:
- On the other hand, increasing carbon content in steel usually decreases ductility. This is because the presence of carbon atoms can create barriers to dislocation movement, making it more difficult for the material to deform plastically without fracturing. As a result, higher carbon content steels tend to be more brittle and have reduced ductility.
Therefore, the correct answer is option 'A': increasing carbon content in steel increases ultimate strength but decreases ductility. It is important for engineers and material scientists to carefully consider the trade-off between strength and ductility when selecting the carbon content in steel for a particular application.
- Ultimate Strength:
- Increasing carbon content in steel typically leads to an increase in ultimate strength. This is because carbon atoms occupy interstitial positions in the iron crystal lattice, leading to distortion and strengthening of the lattice structure. This results in higher strength and hardness of the steel.
- Ductility:
- On the other hand, increasing carbon content in steel usually decreases ductility. This is because the presence of carbon atoms can create barriers to dislocation movement, making it more difficult for the material to deform plastically without fracturing. As a result, higher carbon content steels tend to be more brittle and have reduced ductility.
Therefore, the correct answer is option 'A': increasing carbon content in steel increases ultimate strength but decreases ductility. It is important for engineers and material scientists to carefully consider the trade-off between strength and ductility when selecting the carbon content in steel for a particular application.
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Increasing carbon content in steel, _________ ultimate strength and ____ ductility of steel.a)increases, decreasesb)decreases, decreasesc)increases, increasesd)decreases, increasesCorrect answer is option 'A'. Can you explain this answer?
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