Why does steel change colour as it's heated, and what happens to it's structure?

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paul.fr

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Why does steel change colour as it's heated, and what happens to it's structure?

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Offline lightarrow

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Why does steel change colour as it's heated, and what happens to it's structure?
The colour is due to the formation of thin layers of oxide; the exact colour depends on the exact film's tickness: see interference by thin layer or similar concept. There is something here:
http://en.wikipedia.org/wiki/Anti-reflective_coating