01 is best HT'ed in a HT oven. It is not a good choice for beginner forging or forge HTing, as It needs a 15 to 20 minute soak at 1475°, then be quenched in a medium speed oil. If forging it, it should be forged roughly 100° hotter than simpler steels. Did you allow a generous radius where the tang meets the main blade? An 01 blade probably should be completely submerged, but I seldom do. After forging, did you anneal, then normalize and heat cycle for grain size? What does the grain look like at the break?