Abstract: In this paper, the fracture toughness (KIc) of steel-bonded carbide has been determined by a method of three points crook while the state of fracture section has been observed with SEM. Author considers that it is more suitable to substitute once-impact toughness by fracture toughness (KIc) for evaluating the toughness of steel-bonded carbide.
When the die of steel-bonded carbide is used in cold working, brittle fracture is the main form of losing its efficiency. The paper has discussed the wear tests under the condition similar to cold working. The following result has been discovered that the wear resistance of alloy is a function of hardness and fracture toughness. Using an optimal heat treatment process will enable to improve on the performance duration of die.