pearlitic การใช้

The hamon outlines the transition between the region of harder pearlitic steel at the center and back of the sword.
For this reason, the bainitic microstructure becomes useful in that no additional heat treatments are required after initial cooling to achieve a hardness value between that of pearlitic and martensitic steels.
Cooling a hypoeutectoid steel ( less than 0.77 wt % C ) results in a lamellar-pearlitic structure of iron carbide layers with ?-ferrite ( nearly pure iron ) between.
This eliminates the toughness-reducing effect of a pearlitic volume fraction yet maintains and increases the material's strength by refining the grain size, which in the case of ferrite increases yield strength by 50 % for every halving of the mean grain diameter.