Speaker
Description
The hardness of adamite roll materials for hot work rolls depends on
their microstructures; the amount and hardness of coarse carbides and the
hardness o f matrix. The high-hardened adamite roll materials are excellent
in wear resistance when the amount of coarse carbides is about
8 %, but the wear resistance deteriorates when the amount of coarse carbides
exceeds a critical level.
The reason is considered to be as follows : As the volume of coarse
carbides increases, the spacing between coarse carbides decreases and the area of coarse carbides in contact with hot strip surfaces also increases, to induce a partial disintegration of brittle coarse carbides. The high-hardened adamite rolls with about 8 % of coarse carbides have a hardness from Hs 65 to 70 and can be used for hot work rolls with satisfactory results.