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Surface "bubbles"?

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Just finished my heat treating on 2 spring blades. One came out with a "bubbly" like texture on the surface and the other not. Hope it's not too basic a question, but is the texture normal or is it a sign of overheating?

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If I understood well what you mean with "bubbly texture", I think that it is a sign of overheating and heavy oxidization.

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