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FWIW, the parting line (the seam) of the one pictured above is wide enough to be a forging. Parting lines in castings are classically very narrow, nearly knife-edge widths.
I'm curious about how those came to be considered castings.
Failure looks like a one time, brittle failure overload. No obvious fretting & "beachheads" visable. I'm suspecting that heat treat or alloy choice, or both, is the root of the problem.
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