Metallurgy Interview Question:

What does allotropic mean what does iron and steel have to do with it?

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Iron is a metal with polymorphism structure. Each structure stable in the range of temperature, for example delta-iron with bcc structure in the range of 1538-1394C changes to gamma -Iron with fcc in the range of 912-1394C and gamma iron to Alfa-Iron etc. For hardening of the metal, this quality of iron is exploited.
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