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As the amount of carbon in steel increases, its ___________ decreases.

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As the amount of carbon in steel increases, its ___________ decreases.

(a) range of heat treatment

(b) toughness

(c) ultimate strength

(d) hardness

I have been asked this question during an interview.

This intriguing question originated from Properties of Steel and its Alloys topic in division Steel and its Alloys of Aerospace Materials & Processes

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Correct answer is (b) toughness

Easiest explanation: Carbon combines readily with iron and is a very important component of steel. As the amount of carbon in a substance increases, its toughness decreases. Ultimate strength, hardness and range of heat treatment increase.

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