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What causes rainbow color in heated steel?

  1. Apr 12, 2013 #1
    Hi,

    This question came up after some stainless steel samples were exposed to high temperatures (metal flame holders in a combustion chamber). Some of them had areas with rainbow colors. What exactly happens to the steel that causes these local rainbows? If the colors in point A and B on the sample are different, does that mean that in point A the steel has been exposed to different temperatures than in point B?
     
  2. jcsd
  3. Apr 12, 2013 #2

    AlephZero

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