Yep, as I mentioned, this is where almost all fatigue failures occur, no matter what the material. And when it happens, the frame is usually at the very least safe enough to coast to a stop, often still rideable.

I have had a steel fork crack right below the crown lug, by the way. Scary stuff. I was okay because I had a front rack on the touring bike I was riding at the time, that was the only thing holding it together. I knew something was up when I noticed a lot of vibration while braking. Everything and anything can break. All of it.