Abstract
In this study, the investigation and discussion of the fracture toughness and fatigue strength of cold work tool steel were carried out. The materials under test were rotary bending fatigue specimens of SKD11, and fracture toughness specimens made that specimens. Fatigue strength, fracture toughness and hardness were measured by the rotary bending fatigue test, fracture toughness test of SEPB method and hardness test. From the results of rotary bending fatigue test, the variations were observed in the fatigue strength. From the results of fracture toughness test and hardness test, if the variation of the S-N property is small, fracture toughness and hardness were almost the same values.
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