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With a sealed bearing, this all takes place inside the bearing and unless you've opened it up wouldn't be visible, so I doubt that's what you're referring to.
But I assume I'd feel it? So just a change of bearings, rather than a full headset replacement.
Jon.-
The steering feels "notchy"? Is this what you mean, when you say "I seem to have managed it."?
If so, then I'd think new bearings are all you'd need. But when you strip it down, check that the bearings are still a snug fit in the cup or seat.
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I recently thought I'd brinnelled a cartridge headset, but it was just over-tightened. Once I'd taken it out to check which cartridge I needed to buy and put it back, it was fine. I hadn't done 50k on it, however.
Scilly.Suffolk
mattioats
No.
And yes (sort of).
The term is, incorrectly, used to describe pits in the bearing race caused by micro-welds between the bearing and the race, caused by vibration from the road. When the welds are broken (when you steer), material is removed from the softer race, rather than the from the harder bearing.
As headset bearings return to the same place (when you straighten the steering), the repeated forming and breaking of welds creates pits; these pits resemble the results of a Brinell hardness test, hence the misnomer.
With a sealed bearing, this all takes place inside the bearing and unless you've opened it up wouldn't be visible, so I doubt that's what you're referring to.