Abstract
Fracture toughness tests of sintered and melted high speed steels were carried out to develop the method for evaluating fracture toughness. The precrack introduced by the BC (Bridge Compression) method, at the front of which the damage region with microcracks was formed, could not be assumed an ideal crack. On the other hand, the precrack was introduced by the FP (Fatigue Precracking) method, where the fatigue precrack was introduced under a sufficiently low level of Kfmax, could be assumed an ideal crack. The KIC-values evaluated by the BC method were lower than those by the FP method. Therefore, the fatigue precrack is necessary to introduce for evaluating fracture toughness. The size and volume fraction of carbides in the sintered high speed steel are smaller and higher, respectively, than those in the melted high speed steel. Since in the present sintered high speed steel these effects of the size and volume fraction of carbides compensated each other, the fracture toughness of the sintered high speed steel was almost equal to that of the melted high speed steel.
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