I have 2 boxes mixed with black walnut, mahogany, and some curly cherry. Got them all put together and started finish grinding a couple blades and saw a Crack in one.....
After I broke it, the boxes are still there because I was a bit pissed to say the least.
At least my heat treat was good. Grain structure is really tight and I took the bottom piece and smashed it into the vise 3 times. Had to file the vise, but you can't see where I hit on the blade. I think I got a bad spot in the steel because the Grain looks like a pocket right there and is huge.
It was mono steel so it wasn't a weld flaw. That's all I can figure is the bar had a bad spot.