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I might suggest that it can be difficult to achieve the Bainite phase, whithout going to either Pearlite or Martensite, and even more difficult to assess whether it has been achieved or not.
But,...

O1 is a very common alloy of Oil Hardening Tool Steel... Probably the most common. When taken to the limits of it's range on the Rockwell scale, it can be quite brittle. I think there are better...