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Which of the following are the parameters of the iron-carbon diagram on the x and y-axis respectively?

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Which of the following are the parameters of the iron-carbon diagram on the x and y-axis respectively?

(a) Carbon percentage and Iron percentage

(b) Carbon percentage and temperature

(c) Temperature and carbon percentage

(d) Iron percentage and temperature

I had been asked this question in a job interview.

This interesting question is from Materials in chapter Materials of Corrosion Engineering

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Correct choice is (b) Carbon percentage and temperature

The best explanation: The iron-carbon phase diagram is an equilibrium phase diagram formed with carbon percentage and temperature parameters on the x and y-axis respectively. It consists of various phases such as alpha iron, austenite phase, delta iron, and its combinations.

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