Did you find fracture initiated at surface or subsurface inclusions?

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Vladimir Dusevich

What metal are you talking about?

For cheap carbon steels simple oxide (Al2O3) is a common cause of fracture. Near surface inclusions can initiate contact fatigue cracks. And so on.

Nikhil Sarkar

Thanks.

I was referring to NiTi dental rotary instruments.

Sorry, RG posted your question without connection to your project, so I was wondering...