Q. The existence of two or more crystal structures for any substance, depending on temperature, is known as _________

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Q. Pure iron exists in ________ allotropic forms.

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Q. What is the crystal structure of ϒ iron?

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Q. At what temperature range is δ iron stable?

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Q. Which of the following is applicable to α iron?

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Q. Which of the following is a nonmagnetic iron?

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Q. Cementite is magnetic up to ________

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Q. ___________ is a mixture of radial lamellae of ferrite and cementite.

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Q. ___________ is a eutectic mixture of α iron and Fe₃C.

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Q. The eutectic point in the iron-iron carbide phase diagram occurs at __________ weight % composition of carbon.

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Q. At what temperature does δ ferrite melt?

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Q. What is the solubility of α ferrite at 0°C?

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Q. What is the crystal structure of austenite upon heating?

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Q. How much iron does cementite contain?

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Q. What is the maximum solubility of carbon in austenite at 1148°C?

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Q. At what temperature does peritectic reaction occur?

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Q. Peritectic reactions are applicable for carbon contents up to _________

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Q. How much austenite does eutectic reaction form?

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Q. At what temperature does eutectoid reaction occur?

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Q. Composition up to 0.008% carbon is considered as _________

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